The Dongying-Hainan airline         for about 5 months. I have taken the flights three times.
#38883
A
is open
B
has opened
C
has been open
D
has been opened
推荐题目
Do you know what     in the room at the moment?
#40168
A
they were doing
B
were they doing
C
they are doing
D
are they doing
Our teacher ____ in our school for 29 years and he ____ here when he was 23 years old.
#41848
A
has taught has come
B
taught , comes
C
taught , came
D
has taught, came
If it ______ tomorrow, we’ll go to Bird’s Nest.
#42388
A
didn’t rain
B
won’t rain
C
doesn’t rain
D
isn’t raining