--Is Mr Brown driving here?---I'm not sure.He___come by trainA.may B.shall C.need D.must

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--Is Mr Brown driving here?---I'm not sure.He___come by trainA.may B.shall C.need D.must
--Is Mr Brown driving here?---I'm not sure.He___come by train
A.may B.shall C.need D.must

--Is Mr Brown driving here?---I'm not sure.He___come by trainA.may B.shall C.need D.must
A may表示不确定

A

A

选A,因为是“I'm not sure”