题目内容
At a time when he ________ for his master degree, we decided not to burden him with our problems.
- A.busy studying
- B.being busy in studying
- C.busy to study
- D.was busy with study
D
形容词busy的用法是be busy doing sth/be busy with sth意思是“忙于做某事”。
形容词busy的用法是be busy doing sth/be busy with sth意思是“忙于做某事”。
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