They must have finished the work,---?A,mustn't they B,haven't they C,hadn't they D,didn't they

问题描述:

They must have finished the work,---?A,mustn't they B,haven't they C,hadn't they D,didn't they

D must have done表示对过去的较为肯定的猜测,既为过去,就用did反问

B
这里的must表推测,变成反义疑问句时,要把它去掉
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