Question

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

A. how to do with it B. how to do

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。