Itwasveryhardformyparentstopaynyeducationfees___

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

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”