The astronaut did many experiments in the spaceship, ______ much help for knowing space.
A．which we think it isB．which we think are of
C．of which we think areD．I think which is of
B

試題分析：句意：宇航員在宇宙飛船里做了許多實驗，我們認為這些實驗對理解太空知識很有幫助。轉(zhuǎn)換句子結(jié)構(gòu)，答案就會顯露出來：…and we think they(the experiments) are of much help for knowing space.
be of much help="be" very helpful。which的先行詞為“the experiments”；we think變成了插入語。去掉這個插入語，答案更加明了。
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