be busy( )sth

如题所述

1)be busy doing sth.
忙于做某事,动词用成v.ing
They are busy doing their homework.
他们正忙于做作业。

2)be busy with sth.
忙于做某事,with后跟名词或代词
They are busy with their homework.
他们正忙于做作业。
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第1个回答  2017-08-12
be busy with sth 忙于某事
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