Question

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

Answer 1

B

此題考查when引導的兩種從句。第一空when引導賓語從句，意思是“我不知道他什么時候會來”所以用will come表將來；第二空when引導時間狀語從句，符合“主將叢現”原則。所以該從句用一般現在時。