Not often______fatal, but immediate medical attention is essential.

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问题 Not often______fatal, but immediate medical attention is essential.

选项 A、a rattlesnake bite is
B、the bite of a rattlesnake
C、rattlesnake’s bite
D、is a rattlesnake bite

答案D

解析 The first clause needs a subject and verb. After the introductory negative not often, the subject and verb are inverted: is a rattlesnake bite.
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