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【题目】While his friends for him, they heard a scream.

A.waitB.are waitingC.waitedD.were waiting

【答案】D

【解析】

句意:当他的朋友正在等他时,他们听到了叫喊声。

考查时态。wait一般现在时;are waiting现在进行时;waited一般过去时;were waiting过去进行时。根据heard可知,表示过去,排除AB;且根据句意可知,表示他的朋友正在等他的时候,他们听到了叫喊声,故选D

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