问题
选择题
When the fire broke out, Mary didn't know _____. [ ]
A. what do
B. what thing to do
C. what to do
D. to do what
答案
答案：C
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When the fire broke out, Mary didn't know _____. [ ]
A. what do
B. what thing to do
C. what to do
D. to do what
答案：C