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Chang’e­2 did many experiments, ______ I think are of much help for knowing space.

A.which B.what C.when D.where

A

解析试题分析:考查定语从句。“嫦娥二号”做了许多试验,我认为这些试验对人们了解太空很有帮助。I think是插入语,可忽略,定语从句缺少主语,排除C、D;what不引导定语从句。故选A。
考点:考查定语从句

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