题目内容
【题目】— What on earth are the police busy with?
— They _____into how the plane crash came about.
A.had been looking B. were looking
C. would look D. have been looking
【答案】D
【解析】
试题分析: 句意:--警察到底在忙些什么?--他们一直在调查飞机失事发生的原因。这里使用现在完成进行时,表示现阶段一直做的事情,故选D。
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