题目内容
20.放学后,他们正忙于做扫除.They arebusy doingsome cleaning after school.
分析 busy doing.
解答 答案.busy doing.
表达的是客观事实用一般现在时,表示忙于做某事be busy doing sth,大扫除do some cleaning,故答案是busy doing.
点评 be busy doing sth侧重于动作
be busy with sth 侧重于状态
意思都一样,可以互换.
He is busy doing homework.=
He is busy with homework.
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