21、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
科目：高中英语 来源： 题型：
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
科目：高中英语 来源： 题型：
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
科目：高中英语 来源： 题型：
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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