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    精英家教网 > 高中英语 > 题目详情

    John ______ in his room when he heard screaming.
    A．is studyingB．studiedC．was studyingD．has studied
    C

    试题分析：重点理解句意，从而判断时态的选择。句意：当约翰听见尖叫声时，他正在他的房子里学习。从when所引导的时间状语从句看，动作发生在过去，可知句子要用过去进行时，表示过去某个时间正在做某事。
    点评：本题不难，重在理解好四个选项中时态之间的区别。现在进行时表示动作正在进行，此题中又heard 过去时所以排除；一般过去时仅仅表示动词在过去发生；现在完成时表动作已经完成，并对现在造成了影响，通常跟一段时间连用。
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