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

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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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Althoughtheyhadsignedthepeacetreaty,theywere______preparingforarenewe