This key ___ be Peter's.His is still in the lock.A.may notB.can'tC.mustn'tD.needn't选择原因?

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This key ___ be Peter's.His is still in the lock.A.may notB.can'tC.mustn'tD.needn't选择原因?
This key ___ be Peter's.His is still in the lock.
A.may not
B.can't
C.mustn't
D.needn't
选择原因?

This key ___ be Peter's.His is still in the lock.A.may notB.can'tC.mustn'tD.needn't选择原因?
B can't
因为肯定的语气用must,否定要用can't ,而不能用mustn't

B
语义是强烈否定的

B
can't be一定不是, 以为后面有:His is still in the lock。

B 表示不可能,他的钥匙在锁头上呢

B 从后面的可以看出,Peter还是被锁的,所以肯定不是他的钥匙。

B
can't be Peter's 不可能是某人的

B 不可能的事