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If we________ , we can realize the progress we have made in space research.
A．turn backB．look backC．a(chǎn)nswer backD．move back
B
look back在這里是“回顧”的意思，turn back有“轉(zhuǎn)身”的意思，因此B為最佳答案。C沒有相關(guān)表達(dá)；move back表示“搬回”的意思，不符合句子的意思。
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