I was surfing the Internet my brother wa

问题选择题

I was surfing the Internet my brother was doing his homework.

A．after

B．because

C．while

D．When

答案

答案：C

题目分析：句意：当我的弟弟在做作业的时候，我在上网。A在……之后 B因为 C当……时候（同时进行）D当...时候，就在这时；此题中两个动作同时进行，而且连词后是进行时态。所以要用while。故选C.