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 Therewassomethingwrongwiththenetwork,orthee-mail____ea...

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问题详情:

 Therewassomethingwrongwiththenetwork,orthee-mail____ea...

 There was something wrong with the network, or the e-mail____ earlier.

       A. could have been sent            B. might be sent

       C. need have been sent              D. must be sent

【回答】

A

知识点:虚拟语气与情态动词

题型:选择题

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