I can't remember his mobile phone number.What___I do?A.can B.could C.may D.should为什么选D不选A呢?

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I can't remember his mobile phone number.What___I do?A.can B.could C.may D.should为什么选D不选A呢?
I can't remember his mobile phone number.What___I do?A.can B.could C.may D.should
为什么选D不选A呢?

I can't remember his mobile phone number.What___I do?A.can B.could C.may D.should为什么选D不选A呢?
should 比 can 婉转一些.