Question

I'm sure he will jump up when he ________ the good news.

1. A.
   learn about
2. B.
   will learn about
3. C.
   learning about
4. D.
   learns about

Answer 1

D
考查主从句的时态关系。当主句是一般将来时的时候，时间或条件状语从句用一般现在时，故选D。