选A
这是一个表语从句,表语从句的引导词有：that, what, who, when, where, which, why,
whether,how.
所以because开头的肯定不对
而选项C不能用在这里reason为主语的情形,假如用why 的话,要这么说：
This was why she failed in the exam.
否则句子的意思都不对了.
The reason she failed in the exam was______.
5个回答
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