He had just sent an e­mail to his pal on the Internet the system broke down.A. whileB

发布时间：2020-08-17 06:20:04

He had just sent an e­mail to his pal on the Internet      the system broke down.
A. while
B. when
C. after
D. since

网友回答

A. while
(答案→)B. when
C. after
D. since
解析：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。
以上问题属网友观点，不代表本站立场，仅供参考！