1.A 是正确答案.
英语中表示推测时,must 用于肯定句,语气比较强烈,译为“一定”.
can 一般用于否定和疑问句,can't 表示“不可能”,may用于肯定、否定句的推测,表示不太有把握.
eg.The man can't be Mr Li.He has gone to Beijing.那人不可能是李先生,他已经去北京了.
2.A 是正确答案.句意是：你最好问问人,否则你可能会迷路的.只是说可能会迷路,但是不一定迷路,语气较弱,不太有把握,所以用may.
Li Fang isn’t in the classroom.He____be at lirbary.Let’s go
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