There was something wrong with the network, or the e-mail____ earlier.
A．could have been sentB．might be sent
C．need have been sentD．must be sent
A

試題分析：考查隱含的虛擬語氣：句意：網(wǎng)絡有問題了，否則電子郵件可能早就被送到了。這里的or相當于="if" There hadn’t been something wrong with the network所以主句用could have done，選A。
點評：有時，句子沒有直接給出假設情況的條件，而須通過上下文或其他方式來判斷。這題用了otherwise，or代替if的虛擬語氣，主句是1、表示與現(xiàn) 在事實相反的情況，主語+should/would/could/might+do：　2、表示與過去事實相反的情況，主句：主語+should/would/could/might+have done　3、表示對將來情況的主觀推測，主句：主語+should/would/could/might+do。
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