be busy 后面加动词的什么形式

如题所述

be busy 后面加动词的ing形式,即doing形式
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第1个回答  2012-01-12
加动词ing形式
be busy doing sth. 忙于做某事
第2个回答  2012-01-12
be busy with sth/n
eg. He is busy with his homework.
be busy doing sth
eg. He is busy doing his homework.
第3个回答  2012-01-12
be busy doing sth. 忙于做某事
第4个回答  2012-01-12
be busy with sth
be busy doing sth
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