问题
选择题
.It is cold in the room. You must have turned off the steam, ______ you?
A．don’t
B．didn’t
C．haven’t
D．mustn’t
答案
答案：C
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.It is cold in the room. You must have turned off the steam, ______ you?
A．don’t
B．didn’t
C．haven’t
D．mustn’t
答案：C