题目内容

If we________ , we can realize the progress we have made in space research.
A．turn backB．look backC．answer backD．move back
B
look back在这里是“回顾”的意思，turn back有“转身”的意思，因此B为最佳答案。C没有相关表达；move back表示“搬回”的意思，不符合句子的意思。
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