问题
选择题
They must have finished the work by the end of last month, ______?
A．mustn’t they
B．haven’t they
C．hadn’t they
D．didn’t they
答案
答案：C
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They must have finished the work by the end of last month, ______?
A．mustn’t they
B．haven’t they
C．hadn’t they
D．didn’t they
答案：C