---What was your brother doing at this time yesterday?---He was reading a magazine ______ I was writing an e-mail at home.A.as soon asB.afterC.untilD.while
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D解析考查连词的用法。 as soon as“一……就……”； after“在……之后”； until“直到……”；
while“当……时候，和……同时”。由答语“他在读杂志而我在写电子邮件”可知，两个动作同时进行，故选D。