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【题目】The policeman asked the old man what he __________ doing when the accident __________.

A.isoccurB.wasoccurringC.ishas occurredD.wasoccurred

【答案】D

【解析】

句意:警察问老人事故发生时他在做什么。

考查过去进行时和when引导的时间状语从句。第一个空是由what引导的宾语从句,主句时态为一般过去时,宾语从句必须是一种过去的时态,故AC选项可排除。第二个空是when引导的时间状语从句,应填入从句谓语,B选项第二个空occurring不能作谓语,可排除,故选D

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