2. 外语
  3. Little did they realize that they ______ (make) an important discovery in science.

Little did they realize that they ______ (make) an important discovery in science.

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问题 Little did they realize that they ______ (make) an important discovery in science.
选项
答案had made
解析 过去完成时。此句little位于句首，引起了部分倒装句。而此题考查的是宾语从句中的时态。由于主句是过去时，从句动作发生在主句之前，所以从句使用过去完成时。[例句] At last they knew that they had made a big mistake最后他们知道他们犯了一个严重的错误。
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