【題目】---Mary can’t help her mother______the house. Why ?

--- Because she is busy____ a cake.

A. cleaning; to make B. cleaning; making

C. to clean; making D. to clean; to make

【答案】C

【解析】試題分析：句意：——Mary不能幫她媽媽打掃房子。為什么？——因為她忙于制作蛋糕。幫助某人做某事是help sb (to) do sth；忙于做某事是be busy doing sth。故選C。

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