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My mother is busy_____ the room.
A.cleanB.to cleanC.cleaningD.cleans
C

试题分析:根据题干可知,此句考查的重点是固定短语be busy doing sth表示忙于做某事,本句的含义是妈妈正忙着打扫房间,故选C。
点评:此题考查动词的形式,在此句型结构中要用动词的ing形式。和它含义类似的短语还有 be busy with sth表示忙于做某事,因此要分清两者之间的不同。
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