He had just sent an email to his pal on the Internet ________ the system broke
题型：不详难度：来源：
| A．while | B．when | C．after | D．since |
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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。
考点： |
举一反三
| We must get up early tomorrow，______ we’ll miss the first bus to the Great Wall． |
He’s got himself into a dangerous situation______he is likely to lose control over the plane.| A．where | B．which | C．while | D．why |
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Police have found ______appears to be the lost ancient statue.| A．which | B．where | C．how | D．what |
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