题目内容
18.John _______ in his room when he heard screaming.( )A. | was studying | B. | studied | ||
C. | had studied | D. | has been studying |
分析 当约翰听到尖叫时,他正在房间里学习.
解答 答案:A.根据when he heard screaming可知当约翰听到尖叫时,他正在房间里学习,所以前句用过去进行时,答案是A.D项是现在完成进行时,表示从过去开始一直到现在.
点评 考查过去进行时.
现在完成进行时表示从过去某一时间开始一直延续到现在的动作.现在这个动作可能刚刚终止,也可能仍在进行.
I have been sitting here all afternoon.
我在这儿坐了一下午了.

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