I hear John singing downstairs.----It___be John ,for he left for tokyo yesterday.A.may not B.can not C.must not D.shall not 选B是吗?

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I hear John singing downstairs.----It___be John ,for he left for tokyo yesterday.A.may not B.can not C.must not D.shall not 选B是吗?
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I hear John singing downstairs.----It___be John ,for he left for tokyo yesterday.A.may not B.can not C.must not D.shall not 选B是吗?
I hear John singing downstairs.----It___be John ,for he left for tokyo yesterday.A.may not B.can not C.must not D.shall not 选B是吗?

I hear John singing downstairs.----It___be John ,for he left for tokyo yesterday.A.may not B.can not C.must not D.shall not 选B是吗?
应该是 表示肯定的推测

对，B，表猜测