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 sentD．must be sent
A

試題分析:考查情態(tài)動詞的用法。A可能已經(jīng)被發(fā)送； B 或許要被發(fā)送 C 過去需要被發(fā)送；D 肯定要被發(fā)送；句意：網(wǎng)絡(luò)出故障了，否則這個郵件早就被發(fā)送出去了。從句子時態(tài)可以判斷是對過去的推測，情態(tài)動詞+動詞原形是對現(xiàn)在或?qū)硎虑榈耐茰y判斷，所以B，D選項不正確。根據(jù)句意排除C選項，故A 為正確選項。
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