He was reading a book___I met him.A.the first time when B.the first time C.the first time where

问题描述:

He was reading a book___I met him.A.the first time when B.the first time C.the first time where
选什么 为什么?
D.when the first time

a
这句话的意思是当我第一次看到他的时候他在读一本书.
这是从句,就一定要有连接词,所以排除b,c语义不通.