单项选择题
When you exchange e-mail with someone, the messages sent between you and that person pass through several computers before they reach their destinations.
A.当你与某人互相交换邮件时,你和那个人的信息到达目的地之前要经过几台计算机。
B.当你与某人发邮件时,你和此人之间发送的信息要经过几台计算机才能到达目的地。
C.当有人和你互相交换邮件时,你们想要达到目的,得需要几台计算机才能实现。
D.当你和别人交换邮件时,信息需要在你和那人之间发送,还得经过几台计算机才到达。
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单项选择题
The ______ between the two buildings measures 30 meters.
A.interval
B.pace
C.realm
D.district
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单项选择题
The secretary worked late into night, ______ the long speech for the president.
A.to prepare
B.preparing
C.prepared
D.was preparing
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