题目

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 【解析】 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。

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