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题目
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He had just sent an e­mail to his pal on the Internet ________ the system broke down.
A.whileB.whenC.afterD.since

答案
B
解析

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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试题【He had just sent an e­mail to his pal on the Internet ________ the system broke 】;主要考察你对连词等知识点的理解。[详细]
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