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【题目】The difficulty lies in ________ they will come to our help immediately.

A. whether B. that C. if D. which

【答案】A

【解析】

试题分析:句意:困难是他们是否能立刻来帮助我们。lie in后是宾语从句,介词后的宾语从句表示是否的时候时,用whether不用if。故选A。

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