There was something wrong with the network, or the e­mail earlier.A. could have been

发布时间：2020-08-17 10:00:19

There was something wrong with the network, or the e­mail      earlier.
A. could have been sent
B. might be sent
C. need have been sent
D. must be sent

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(答案→)A. could have been sent
B. might be sent
C. need have been sent
D. must be sent
解析：A 考察虚拟语气。句义：网络出了问题，否则那封电子邮件本可以早点发出去的。Or表示的是含蓄的虚拟语气，后面的句中相当于主句，根据前面句中的一般过去时可知，or后面的句中谓语动词应该是should/could/would+ have done。故A正确。
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