单选题
He didn't know German, ______ made it difficult for him to study at a university in Germany.
A、
that
B、
as
C、
which
D、
this
【正确答案】
C
【答案解析】
他不懂德语,这使他很难在德国的大学学习。非限定性定语从句,指代前一句的内容,关系代词在句中做主语。
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