问题
选择题
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
答案
答案：C
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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
答案：C