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    精英家教网 > 高中英语 > 题目详情
    He had just sent an e­mail to his pal on the Internet ________ the system broke down.
    A．whileB．whenC．afterD．since
    B

    试题分析：句意：他刚刚在网上发给他的网友一封电子邮件，电脑的系统就出故障了。while 在……期间，表示时间段； when 在这时，表示时间点；  after 在……之后；since 自从。根据句意表示正在此时，因此用连词when。故选B。
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