I was surfing the Internet my brother was doing his homework.A．afterB．beca
题型：不详难度：来源：
I was surfing the Internet my brother was doing his homework.| A．after | B．because | C．while | D．When |
|
答案
| 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. |
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