2. 外语
  3. The workers are busy ______ the house.

The workers are busy ______ the house.

admin2009-06-21  99
问题 The workers are busy ______ the house.
选项 A、to build
B、built
C、building
答案C
解析 be busy doing sth．固定搭配，忙于做某事。
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