They must have finished the work by the end of last month,______?

They must have finished the work by the end of last month,______?

题目
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
B 在表示猜测的反义疑问句提问中,如果出现明显的时间表示,那么反义疑问句,
就根据这个时间状语来写,因为是by last month,所以用过去完成时
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