题目内容：

by which time ,in which time 区别

优质解答

要区别先将which分出来.他只是一个定语,就是什么时间,怎么译取决于前文所提到的,比如前文说吃饭时,那么他就译为吃饭
in which time 就译为吃饭时
by which time 就可译为吃饭前
简单说来就是in 和By的区分,