This is the teacher ( ) is very strict with us 此题正确答案为who 但选项中有that,为什么不行?

题目

This is the teacher ( ) is very strict with us 此题正确答案为who 但选项中有that,为什么不行?
that为什么不行？

答案

只能是因为前面有一个指示代词this了,用that有些别扭.少见.
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