——Did you find the missing couple in the mountain yesterday?——No, but we _____ to get in touch with them ever since.
#101360
A
have tried
B
have been trying
C
had tried
D
had been trying
推荐题目
All the preparations for the task ______, and we're ready to start. 
#104316
A
completed
B
complete
C
hadbeencompleted
D
havebeencompleted
My sister _____ Tony for ten years next year.
#99353
A
has been married to
B
had been married with
C
will have been married to
D
will have been married with