2. 外语
  3. Although the first pulsar, or rapidly spinning collapsed star, to be sighted was in the summer of 1967 by graduate student Jocel

Although the first pulsar, or rapidly spinning collapsed star, to be sighted was in the summer of 1967 by graduate student Jocel

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问题 Although the first pulsar, or rapidly spinning collapsed star, to be sighted was in the summer of 1967 by graduate student Jocelyn Bell, it had not been announced until February 1968.
选项 A、Although the first pulsar, or rapidly spinning collapsed star, to be sighted was in the summer of 1967 by graduate student Jocelyn Bell, it had not been announced until February 1968.
B、Although not announced until February 1968, in the summer of 1967 graduate student Jocelyn Bell observed the first pulsar, or rapidly spinning collapsed star, to be sighted.
C、Although observed by graduate student Jocelyn Bell in the summer of 1967, the discovery of the first sighted pulsar, or rapidly spinning collapsed star, had not been announced before February 1968.
D、The first pulsar, or rapidly spinning collapsed star, to be sighted was observed in the summer of 1967 by graduate student Jocelyn Bell, but the discovery was not announced until February 1968.
E、The first sighted pulsar, or rapidly spinning collapsed star, was not announced until February 1968, while it was observed in the summer of 1967 by graduate student Jocelyn Bell.
答案D
解析 Verb form; Logical predication; Rhetorical construction
This sentence presents conditions that are followed by an unexpected outcome: a delayed announcement of the discovery of a pulsar. A compound sentence using a coordinating conjunction but is an effective way to present the conditions of the first pulsar sighting and then information about the subsequent announcement of the discovery. The sentence must clarify that it is not about the first pulsar, but the first pulsar... to be sighted. The verbs in the sentence must all be in past tense; using a past-perfect verb to present information about the announcement of the discovery indicates that this announcement illogically took place before the pulsar was first sighted.
A The subject of the opening dependent clause is pulsar, and the verb is was. The clause needs to indicate not just that the pulsar existed but that it was observed by Bell; the past-perfect verb tense is inappropriate in the concluding clause.
B The opening participial phrase functions as an adjective, but it has no logical noun or noun phrase to attach to; Bell herself was not announced in 1968.
C Grammatically, the opening participial phrase describes the first noun that follows, but it makes no sense to say that the discovery of the pulsar was observed; discovery of the first sighted pulsar is also imprecise; one does not discover a first sighting.
D Correct. The sentence presents the sequence of events clearly and in the past tense.
E This sentence presents events in a way that is confusing; as a conjunction, while indicates simultaneous events, but this sentence is about events that occurred in a sequence.
The correct answer is D.
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