—Mary cant help the house. Why?—Because she is busy a hotel reservation.A. cleaning; mak

问题补充：

—Mary can help the house. Why?

—Because she is busy a hotel reservation.

A. cleaning; makingB.to clean; makingC. cleaning; to make

答案：

解析：can’t help doingsth 表示忍不住做某事，be busy doing sth表示忙于做某事，故选A