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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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.