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问题: 英语高手来帮忙!!

Such houses _____ he saw are both dirty and expensive.
A. that B. this C. it D. as


答案是啥??原因是啥??

解答:

楼上,哪里有2个as?选that,这是修饰houses的定语从句,as用在非限定定从中,另2个不是定语从句连接词。