I know the reason___he was unhappy at the party that day.A in which B on which C for which D thatI know the reason___he was unhappy at the party that day.A in which B on which C for which D that

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Iknowthereason___hewasunhappyatthepartythatday.AinwhichBonwhichCforwhichDthatIknowthereason___hewasu

I know the reason___he was unhappy at the party that day.A in which B on which C for which D thatI know the reason___he was unhappy at the party that day.A in which B on which C for which D that
I know the reason___he was unhappy at the party that day.A in which B on which C for which D that
I know the reason___he was unhappy at the party that day.
A in which B on which C for which D that

I know the reason___he was unhappy at the party that day.A in which B on which C for which D thatI know the reason___he was unhappy at the party that day.A in which B on which C for which D that
C for which =====why为何,之所以

选C。相当于why.

c
for which引导原因定语从句

选C
我第一反应就是填Why
既然没why，用C答案是一样的，不过好像D理解为同位语其实没多少不对。。

选C

表原因，用FOR。

先行词是表示原因的名词，即reason，用why，在定语从句中充当原因状语，这时一般可以用for ＋which来代替:
I don’t know the reason why/ for which he did it.
.
The reason why/ for which he was afired was not clear.

please tell me the reason___ joining the English club.填什么介词,为什么, I know the feeling, I know ,you know.I know that you know ,I know the you know that I know. this is the reason___ he gave me the other day 这里为什么要用that,不用why或for which The thing is you know,I know. I know you know the biggest i want know the answer FINALLY,I KNOW THE TRUTH. i know the reason 歌词 I know i am not the one I don't(know)the teacher,but I(know about)her.可以换成know about;know? I don't(know)the teacher,but I(know about)her.可以换成know about ; know? I don't know the......the question I know the name （）the boy. Can you know the boy? -Yes,I know修改病句 i know the feeling myself 如何改错 英语翻译i know the answer thanks I think Tom___(know)the answer.