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。
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