【題目】When Mary arrived she found all her children ______ for nearly two hours.

A. have gone to sleep B. fell asleep

C. was falling asleep D. had been asleep

【答案】D

【解析】

試題分析：考查時態(tài)的辨析。這里選用過去完成時，表示事件發(fā)生在過去的過去，由found，我們可以發(fā)現(xiàn)是過去時態(tài)，但是孩子睡著這件事發(fā)生在她發(fā)現(xiàn)之前，故為過去的過去，句意為：當Mary到達時，她發(fā)先孩子們已經(jīng)睡了將近兩個小時。故選D。

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