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

A.a(chǎn)fterB.becauseC.whileD.When

C

解析試題分析:句意:當(dāng)我的弟弟在做作業(yè)的時(shí)候,我在上網(wǎng)。A在……之后 B因?yàn)?C當(dāng)……時(shí)候(同時(shí)進(jìn)行)D當(dāng)...時(shí)候,就在這時(shí);此題中兩個(gè)動(dòng)作同時(shí)進(jìn)行,而且連詞后是進(jìn)行時(shí)態(tài)。所以要用while。故選C.
考點(diǎn):考查時(shí)間狀語從句的用法。

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