定语从句reasonThe reason-- he was ill that day was actually made

定语从句reason
The reason__ he was ill that day was actually made up by himself.In fact,the reason_____ he was absent is ______ he went to see a film.
A.that; why; that
B.for which; why; that
C.that; why; because
D.why; that; became
想问的是
1.第一个空,根据定语从句的语法解释好象也可以啊~
2.B的for which
3.怎么知道什么时候该用定语从句,什么时候用同位语从句呢?

1填why是不对的,填why后面就会解释他生病的原因 比如淋雨啊 感冒啊什么什么的 所以第二空就是解释缺席的原因 就可以填why了.
2for which在某种程度上就是why
3意义上看,同位语从句是名词性从句,是对一个名词加以补充说明,定语从句是形容词性的,对一个名词加以修饰限定.
从结构上看,同位语从句的连接词不充当句子成分,但不可省略；定语从句的关系代词代替先行词在句中充当成分,充当宾语时可省略.第二个句子里面的that就不能省略.
：同位语在中文里相当于冒号：或者阔折号—— 或是括号（） .
eg:他讲的笑话（北极熊拔自己的毛,最后说了一句好冷啊）太冷了.
eg:兄弟伙过来,我听说一件事：我们终于要换班主任了.
定语就是……的.,的前面的内容.
eg:让人想撞墙自杀的音乐.

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