题目内容

I was surfing the Internet       my brother was doing his homework.
A．afterB．becauseC．whileD．When
C

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.
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