2. 外语
  3. They are busy (prepare)______for the conference.

They are busy (prepare)______for the conference.

admin2014-08-07  8
问题 They are busy (prepare)______for the conference.
选项
答案preparing
解析 本题考查固定用法。忙于做某事：be busy doing sth.。
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大学英语三级B级

大学英语三级

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