Question

【题目】The old lady didn’t know when the house caught fire.

A. how to do B. how to do with it C. what to do D. what to do it

Answer 1

【答案】C

【解析】试题分析：句意：当屋子着火时老太太不知道该怎么办。do为及物动词，需接宾语，do sth.做某事，what代词，在此做do 的宾语，结合句意可知可知选C。