Question

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

1. A.
   could have been sent
2. B.
   might be sent
3. C.
   need have been sent
4. D.
   must be sent

Answer 1

A
试题分析：考查隐含的虚拟语气：句意：网络有问题了，否则电子邮件可能早就被送到了。这里的or相当于="if" There hadn’t been something wrong with the network所以主句用could have done，选A。
考点：考查隐含的虚拟语气
点评：有时，句子没有直接给出假设情况的条件，而须通过上下文或其他方式来判断。这题用了Otherwise，or代替if的虚拟语气，主句是1、表示与现 在事实相反的情况，主语+should/would/could/might+do：　2、表示与过去事实相反的情况，主句：主语+should/would/could/might+have done　3、表示对将来情况的主观推测，主句：主语+should/would/could/might+do。