Question

—At weekends, my parents often go cycling with me around the Fishmouth Wetland Park.

—That's great! But my parents are too busy ________ operations to spare me any time.

A.to do B.done C.doing D.do

Answer

C

【解析】

句意：——在周末，我的父母经常和我一起去鱼口湿地公园骑自行车。——太好了！但是我父母忙于做手术，没有时间陪我。

考查非谓语。to do做，动词不定式；done做，过去分词；doing做，现在分词或者动名词形式；do做，动词原形；根据句意理解可知，这里表达的是“忙于做某事”，英语是be busy doing sth.，所以这里应该用doing形式，故选C。