题目内容
用动词的适当形式填空The students in Class Three are busy______(clean)the classroom.
答案:cleaning
解析:
解析:
| be busy (in) doing sth.忙于做…,要用动名词形式。
|
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题目内容
用动词的适当形式填空The students in Class Three are busy______(clean)the classroom.
| be busy (in) doing sth.忙于做…,要用动名词形式。
|