They must have finished the work ?A. mustn’t theyB. haven’t theyC. hadn’t theyD. didn’t t

问题补充：

They must have finished the work, ?

A. mustn’t they

B. haven’t they

C. hadn’t they

D. didn’t they

答案：

A. mustn’t they

(答案→)B. haven’t they

C. hadn’t they

D. didn’t they

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