2. 外语
  3. Although they had signed the peace treaty, they were______preparing for a renewed offensive.

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

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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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本试题收录于： C类竞赛（非英语专业本科）题库大学生英语竞赛（NECCS）分类
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C类竞赛（非英语专业本科）

大学生英语竞赛（NECCS）

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