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

A.afterB.becauseC.whileD.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。

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