His sister has become a doctor,------ is what he wants to be

His sister has become a doctor,______ is what he wants to be.
A.who B.whose C.that D.which
单选
同志们，
你们在说什么呀！
保证没有错。
这是山东的调考题。
还有，这根本就不是从非限制性定语从句的角度来考虑的。

that 在这里指代的是前面的become a doctor.to be a doctor is what he wants to be.这句话不是定于从句.其实这句话在,后面加上一个and 就变得比较明了了.His sister has become a doctor,and that（becoming a doctor） is what he wants to be.becoming是因为become作为动词必须变成现在分词才能当作名词位于句首

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