It's for this reason _ the sky was so blueA for which B why C that答案c 为什么
问题描述：
It's for this reason _ the sky was so blue
A for which B why C that
答案c 为什么
答
有点像《Unfaithful》里的歌词～
强调句，可以说成For this reason, the sky was so blue.
这里只不过强调是“因为这个原因”
答
固定的语法结构,it 做形式主语，真正意义上的主语是that引导的从句，即天这样的蓝的原因是这个。
所以that必选！
答
这句话其实是个同位语从句，this reason作先行词，他和后面的句子是并列关系。最简单的办法判断它是作同位语从句还是定语从句就是看先行词（本句是this reason）是否可以加到从句中。加不进去则是同位语从句，用that引导
常见的同位语句型还有
I have the feeling that
the reason why...is that
it is said that 等
答
that 因为有
was
答
reason 后如果是因果从句应该是why.
但此句不是因果从句,而是强调句式,即It is .that.
所以用that．翻译为：正是因为这个原因,天才这么蓝.
答
这是一个强调句it is ```that```固定句式 去掉这三个单词对句子结构没有影响 强调句的固定搭配所以选c