26．The symbol @ was used to show the cost or weight of something it became the standard——青夏教育精英家教网—

摘要：26．The symbol @ was used to show the cost or weight of something it became the standard symbol for e-mails. A．though B．since C．when D．before

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The @ symbol was used to show the cost or weight of something it became the standard symbol for e-mail．

A．though B．since C．when D．before

The symbol @ was used to show the cost or weight of something __________ it became the standard symbol for e-mails.

A．though B．since C．when D．before

The @ symbol was used to show the cost or weight of something　　 it became the standard symbol for e-mail.

A.though　 B.since　 C.when　 D.before

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