He had just sent an e­mail to his pal on the Internet ________ the system broke down.
A．whileB．whenC．a(chǎn)fterD．since
B

試題分析：句意：他剛剛在網(wǎng)上發(fā)給他的網(wǎng)友一封電子郵件，電腦的系統(tǒng)就出故障了。while 在……期間，表示時間段； when 在這時，表示時間點；  after 在……之后；since 自從。根據(jù)句意表示正在此時，因此用連詞when。故選B。
考點：
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