I( )tell you what I know.A.can only B.only can C.is only D.only am

问题描述:

I( )tell you what I know.A.can only B.only can C.is only D.only am
应该填什么?为什么这样填?

A
only放在助动词,情态动词,动词BE之后,实义动词之前.排除B与D,主语是I,再排除C
祝你假期愉快!加油!不明白再问!