-Is Mr Smith driving here?-I'm not sure.He _____-Is Mr Smith driving here?-I'm not sure.He _____ come by subway.A.may.B.shall.C.need.D.must.

-Is Mr Smith driving here?-I'm not sure.He _____-Is Mr Smith driving here?-I'm not sure.He _____ come by subway.A.may.B.shall.C.need.D.must.
-Is Mr Smith driving here?-I'm not sure.He _____
-Is Mr Smith driving here?
-I'm not sure.He _____ come by subway.
A.may.B.shall.
C.need.D.must.

-Is Mr Smith driving here?-I'm not sure.He _____-Is Mr Smith driving here?-I'm not sure.He _____ come by subway.A.may.B.shall.C.need.D.must.
选A啊 may表示可能的意思,shall是应该的意思,need是需要的意思,must是必须的意思,都不恰当啊

may选A
因为回答说，我不确定I am not sure
所以说他可能乘地铁来，所以是may

A. may.
也可以的意思
应为不确定，所以用may
其余的都是确定的，不适合句情

A

A
史密斯先生是开车来吗？
我不太清楚。也许是乘地铁来吧。
may 可能也许，shall 将 need 需要 must 表肯定的猜测，根据上下文应该是may