为什么要用what?After ten years,she changed a lot and looked diffe

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为什么要用what?
After ten years,she changed a lot and looked different from _____ she used to be.
A.\x05that
B.\x05whom
C.\x05what
D.\x05who

首先排除A that,that 不用在介词from后面.
从句话意思上来说,十年后,她改变了许多,看起来与她的过去有很大的差别.
she used to be ...她过去是怎么样,而不能表示过去她是谁
所以whom与who也不对
只能是what

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