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

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

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

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

 

试题答案

【答案】

A

【解析】

试题

标签：thinkexperimentsofareshy

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