He had just sent an e­mail to his pal on the Internet __

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




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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