题目内容
17．Cissy ______ a magazine carefully in her bedroom when her mother came in quietly．| A． | read | B． | is reading | C． | has read | D． | was reading |
分析 翻译：当Cissy的母亲悄悄地进来的时候，她在她的卧室正认真地看一本杂志．
解答 答案：D．根据 when her mother came in quietly结合语境：当Cissy的母亲进来的时候，Cissy正在看杂志，因此从句该用过去进行时，过去进行时的构成：主语+was/were+动词的ing，主语是Cissy，故用was，故选D．
点评 本题考查的是过去进行时，表示在过去某一时刻或某一段时间内进行或发生的动作．
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