解放军文职考试：先行词为reason时

先行词为reason时，限制性定语可以用why或for which来引导;非限制性定语从句则只能用for which来引导。

　　例3.I had told them the reason, ______ I didn’t attend the meeting.

　　A. for which B. at which C. for whom D. why

　　例4I had told them the reason ______ I didn’t attend the meeting.

　　A. when B. which C. why D. for that

　　解析： 例3意为：“我早已把理由告诉他们，于是我没有出席会议。”先行词为reason时，非限制性定语从句应用for which引导，故选A。例4意为：“我已经把为什么没有出席会议的原因告诉他们。”the reason why...是常见搭配，答案为C。