Our position today is very different from ___ it was 30 years ago.A.what B.which.C.that D.one为什么?

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Our position today is very different from ___ it was 30 years ago.
A.what B.which.C.that D.one
为什么?

A
其他3项语意不完整
what it was 可以构成从句成分,30 years ago为时间状语

A

这是个比较句,空格处要填的是POSITION的代词
A是不确定的指代,B是在某个范围里的指代,D指代的上文中提到的可数名词,而POSITION是地位的意思,为不可数,所以也是错误的
答案选C

C