she asked you when( )again?

题目

she asked you when( )again?
Tell her that I'll let her know when he( )
A.he came ,comes B.would he come ,will come C.he came, will come D.he would come , comes

答案

选 D
第一个 when 引导宾语从句,主句是一般过去时,从句用过去将来
第二个when 引导时间状语从句,主句用一般将来时,从句用一般现在时
句意是：她问你他将什么时候再来.告诉她当他来的时候,我会让她知道的.