题目内容
18．-What were you doing when we were playing basketball yesterday afternoon？-I ______ the classroom．（ ）
| A． | was cleaning | B． | have cleaned | C． | will clean | D． | clean |
分析 --昨天下午当我们正在打篮球时你正在干什么？--我正在打扫教室．
解答 答案：A．根据"What were you doing when we were playing basketball yesterday afternoon？"中的"What were you doing"可知问的是过去的某个时间点正在发生的事，要用过去进行时，其构成：主语+was/were+doing．故选A．
点评 本题考查过进行时的用法，掌握过去进行时的意义即构成，根据关键词判断时态．
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