问题
选择题
My mother is busy _________the room.
A. clean B. to clean C. cleaning
答案
答案：C
题目分析：句意：我的妈妈忙着打扫房间。Be busy doing忙于做，所以选C。
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My mother is busy _________the room.
A. clean B. to clean C. cleaning
答案：C
题目分析：句意：我的妈妈忙着打扫房间。Be busy doing忙于做，所以选C。