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试题详情及答案解析
While I_______ a detective story, someone_______ at the door.
A.read, was knocking
B.read, knocked
C.was reading, knocked
D.was reading, was knocking
答案:C
试题分析:句意:我在读一篇侦探小说时,有人敲门了。根据题干语境while从句的动作应是正在进行,主句的动作应该是一般过去时,故选C。
考点:考查过去时态。