摘要: He must be ill. 他肯定是病了. must表推测,只可用在肯定的陈述句中,意思是 “想必,一定 ;在否定或疑问句中须用can --Listen! Helen is coming. --It a be Helen. She has gone to Beijing. a. can’t b. mustn’t c. may not d. should not

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