【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(shí)態(tài)的辨析。這里選用過(guò)去完成時(shí)，表示事件發(fā)生在過(guò)去的過(guò)去，由found，我們可以發(fā)現(xiàn)是過(guò)去時(shí)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(guò)去的過(guò)去，句意為：當(dāng)Mary到達(dá)時(shí)，她發(fā)先孩子們已經(jīng)睡了將近兩個(gè)小時(shí)。故選D。

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