问题

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 sent
D:must be sent

正确答案是：

同类题型

We __________out by that time that he_________ a thief for a longtime

We will have a football match _____ thisSaturday afternoon..

_________I went to the US,I visited manycities.

______the house was started before she went to Africa and now it is still under construction.

.The gas works ______ near the city.