题目内容
19．Mike _______ in his bedroom when his mother came back home．（ ）| A． | sings | B． | sang | C． | is singing | D． | was singing |
分析 当他妈妈回家时麦克正在卧室里唱歌．
解答 答案：D
根据句中的时间状语从句when his mother came back home"当他妈妈回家时"可知在那一时刻麦克正在唱歌，表示在过去某个时间正在进行的动作，故用过去进行时，其结构是：was/were+动词的现在分词，主句主语是Mike为单数，故用was，又知sing的现在分词为singing，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，结构是：was/were+动词的现在分词
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