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。after在……之后；because因为；while当……时候（同时进行）；when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：考查连词。

考点分析：

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