I was surfing the Internet my brother wa...

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

A. after B. because C. while D. When

C 【解析】试题分析：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. 考点：考查时间状语从句的用法。

考点分析：

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