题目内容
---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
C 【解析】试题分析:句意:——Mary不能帮她妈妈打扫房子。为什么?——因为她忙于制作蛋糕。帮助某人做某事是help sb (to) do sth;忙于做某事是be busy doing sth。故选C。
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