They were most interested in checking the accuracy of the orbits ______ recorded by modem-day astronomers.

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问题 They were most interested in checking the accuracy of the orbits ______ recorded by modem-day astronomers.

选项 A、as
B、which
C、so
D、that

答案A

解析 因为as是连词,可接分词短语作状语,意思为“如……,正如……”,B和D均为关系代词,一般要带从句,所以排除,C项的so是副词,不能引出一个分词短语作状语,所以也排除。
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