题目内容
7．When I came back yesterday evening，my brother _______ his homework．（ ）| A． | is doing | B． | has done | C． | was doing |
分析 当我昨天晚上回来时，我的弟弟正在做作业．
解答 答案：C 根据When I came back yesterday evening可知，时间状语从句是一般过去时态．主句用过去进行时态；过去进行时态的结构为was/were+动词的现在分词．故选C．
点评 判断动词的时态，要结合句子的语境及其引导词去判断动词存在的状态．
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