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---The man in a black suit _______ be our youth worker.
---It _______ be him. I saw him in the classroom building some minutes ago.
A.can; could B.must; can’t C.can; mustn’tD.must; won’t
B

试题分析:本题的含义是穿在黑色套装的那个人一定是我们的青年工人,下句回答在教学楼看到他,所以不可能是他,can't表示猜测不可能的意思,must表示猜测一定的意思,故本题选B。而mustn't表示不准的意思,而won't表示将来时不会的意思,与题意不符。
点评:在英文中情态动词后跟动词原形,注意部分表示猜测单词的区别,must表示的可能性最大,意思为一定,can't表示的可能性最小,意思为不可能,注意它们的使用和区别。
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