The old man didn't know when the house caught fire.[ ]A. how to doB. how to do it C. what to do

题目简介

The old man didn't know when the house caught fire.[ ]A. how to doB. how to do it C. what to do

题目详情

The old man didn't know             when the house caught fire.    
[     ]
A. how to do
B. how to do it  
C. what to do
D. what to do it
题型:单选题难度:中档来源:同步题

答案

C

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