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
B:might be sent
C:need have been sent
D:must be sent
正确答案是:
同类题型
It isn’t going to rain, so you takean umbrella with you.
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We’ll go for a picnic if it _______ thisweekend.
was expecting her favoritesingers,but to herdisappointment, appeared