Question

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

Answer 1

A

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。