It was very hard for my parents to pay ny education fees,_________ were very high

题目内容(请给出正确答案)

It was very hard for my parents to pay ny education fees,_________ were very high in this country.

A. what

B. that

C. which

D. as

参考答案和解析
正确答案:C
本句考查非限定性定语从句中的关系代词。在非限定性关系从句中,指事物用which。题干的意思是:“让我的父母为我付学费有些困难.因为在这个国家学费太贵了。” 
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