-David,is that man your head teacher?It____be him.he's the tallest in our school.A.mustn't B.can't C.needn't D.won't

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-David,is that man your head teacher?It____be him.he's the tallest in our school.A.mustn't B.can't C.needn't D.won't

-David,is that man your head teacher?It____be him.he's the tallest in our school.A.mustn't B.can't C.needn't D.won't
-David,is that man your head teacher?
It____be him.he's the tallest in our school.
A.mustn't B.can't C.needn't D.won't

-David,is that man your head teacher?It____be him.he's the tallest in our school.A.mustn't B.can't C.needn't D.won't
首先,C和D被排除!
来看A,译为:”一定”不是他...
而此句含有猜测之意,故不可用mustn't来全然否定.
而B项则含有猜测之意,译为:不可能是他...

B

选B,must't表示“禁止,绝不”,needn't表示“不需要”,won't表示“(将来)不会”,只有can't表“不可能”,是一种可能性极大的推测.

B.can't