摘要： He must have seen the film yesterday, ? A. hasn’t he B. didn’t he C. has he D. did he 答:B．此句可以解释为 I’m sure he saw the film yesterday, didn’t he?再如: He must be at home now, isn’t he? (=I’m sure he is at home now, isn’t he?) He must have already finish the work, hasn’t he? (~I’m sure he has finished the work, hasn’t he?) He must have been there yesterday, wasn’t he? (=I’m sure he was there yesterday, wasn’t he?)

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