Although they had signed the peace treaty, they were______preparing for a renewe

游客2024-08-15  14

问题 Although they had signed the peace treaty, they were______preparing for a renewed offensive.

选项 A、occupied
B、busy
C、engaged
D、involved

答案 B

解析 be busy(in)doing忙于做…,可省略介词in;be occupied in doing,be engaged in doing,be involved in doing均不可省略介词in。
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