题目内容
19.One morning I was sitting at my desk when a policeman__________ at the door.( )A. | knocked | B. | was knocking | C. | had knocked | D. | knocks |
分析 一天早晨,我正坐在桌子旁时,突然一位警察来敲门了.
解答 答案:A
本题的句型结构是"to be doing…when…",意为"某人正在做…时,突然…";根据句中的时间状语"One morning"以及"I was sitting…"使用了过去进行时,可知此处指的应是发生在过去某天早晨的事情,应使用一般过去时;故选A.
点评 本题考查了一般过去时的用法;做本题时,可根据句中的时间状语以及完整句子所使用的时态,来确定此处应使用的时态;另外,还应熟练掌握一般过去时及其他各时态的意义及用法区别.
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