The key __ be Peter's.His is still in the lock.A,can't B.mustn't

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The key __ be Peter's.His is still in the lock.A,can't B.mustn't
The key __ be Peter's.His is still in the lock.A,can't B.mustn't

The key __ be Peter's.His is still in the lock.A,can't B.mustn't
A
A表示不可能,表示肯定用MUST
例如:The key must be Peter's.表肯定
B表示禁止,不允许,表否定要用can't

A
表猜测。

A.钥匙不可能是比德的,它的还在锁里。