I prefer at home to outside.A staying play B to stay play C staying playing D to stay

问题补充：

I prefer at home to outside.

A staying, play B to stay, play C staying, playing D to stay, playing

答案：

解析：考查prefer用法,prefer A to B相对于A来说,更喜欢B.前后结构要求一致,句意:相对于在外边玩,我更喜欢呆在家.动名词作宾语表示抽象动作,结合语境可知选C.