题目内容
—What’s your mother__________ now？
—She’s __________ our house.
| A．doing, clean | B．do; clean |
| C．does; cleans | D．doing; cleaning |
D
解析试题分析：句意：——现在你的母亲正在干什么？——她正在打扫我们的房间。有时间副词now来修饰，此处用现在进行时，故选D。
考点：考查时态的用法。
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