Question

The reason _______ he gave for his second visit to the city was simply _____

The reason _______ he gave for his second visit to the city was simply _____ he admired the sights here so much.
A. why; that B. why;why C.which; that D.which;why
为什么不选A？
P.S:必须有解析

Answer 1

这里先行词是the reason，定语从句是he gave，he是主语，gave是谓语，缺的句子成分是宾语，当定语从句缺宾语并且先行词指物时，关系代词用that或者which或者省略。
第二空，空格到最后是表语从句，并且不缺成分，所以用that。
因此答案选择C，不懂还可追问啊，我会耐心为你解答的。

Answer 2

the reason why 后接对这个理由的修饰,或者是现在需要解释的一个状况.如:the reason why he was late is that he
was ill. 在这里,he was late是一个需要解释的情况,所以用 the reason why ,这里,用到一个句型:the reason why
... is that...

Answer 3

前面是同为语从句，后面是定语从句， 引导词的作用不同