I was surfing the Internet my brother wa...

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

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

B 【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. after 在……之后；B. while当……时候，（同时进行）； C. because 因为；D. until直到……。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B 考点：考查连词的用法。

考点分析：

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