问题
选择题
18．Everyone must have known the death of the waitress, __________?
A．must they
B．mustn’t they
C．haven’t they
D．have they
答案
答案：C
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18．Everyone must have known the death of the waitress, __________?
A．must they
B．mustn’t they
C．haven’t they
D．have they
答案：C