【題目】I was surfing the Internet my brother was doing his homework.

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

【答案】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)。after在……之后；because因?yàn)?/span>；while當(dāng)……時(shí)候（同時(shí)進(jìn)行）；when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。

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