There was something wrong with the network, or the e-mail____ earlier.
#86903
A
could have been sent
B
might be sent
C
need have been sent
D
must be sent
推荐题目
The students ______ to write English words carefully from the beginning. 
#87647
A
be trained
B
should be trained
C
train
D
to train
— Has Tim started? He said he would join in the party.— He ____.He is a man of keeping his word.
#88048
A
could have left
B
must have left
C
can’t come
D
won’t be coming
 We _________ the difficulty together, but why didn’t you tell me?
#87355
A
should face
B
might face
C
must have faced
D
could have faced