He must be in his room now ,___B__?
A.mustn't B.isn't he
本题选B,因为这句中的情态动词must（肯定,一定）是用来表推测,而 must表推测时,反意疑问句应该看must后面的词,而不用must本身.
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He must be in his room now ,_____?
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