I don’t know when he; when he I’ll tell you. A. come; will comeB. will come; comesC. come

问题补充：

I don’t know when he; when he, I’ll tell you.

A. come; will come

B. will come; comes

C. comes; will come

D. will come; comes

答案：

A. come; will come

(答案→)B. will come; comes

C. comes; will come

D. will come; comes

解析：此题考查when引导的两种从句。第一空when引导宾语从句，意思是“我不知道他什么时候会来”所以用will come表将来；第二空when引导时间状语从句，符合“主将丛现”原则。所以该从句用一般现在时。