题目内容
3．When I came into the hall，the pianist __________ a piece of music．（ ）| A． | is playing | B． | plays | C． | will play | D． | was playing |
分析 当我进人大厅的时候，那位钢琴家正在演奏一首音乐．
解答 答案：D．
根据when引导的时间状语从句用了一般过去时，判断设空处的动作在过去某个时刻，即"当我进人大厅的时候"正在进行着，且动作在一段时间内持续进行，所以用过去进行时，过去进行时的构成是：主语+was/were+动词的现在分词，主语是单数名词，所以be动词用was，故选D．
点评 本题考查时态．每个时态都有标志词，熟记这些标志词是做题的关键．在没有时间状语的情况下可以根据语境来对时态做出判断．
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