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
We’ll go to the park unless it ____tomorrow.     
#38365
A
rains
B
willrain
C
rainy
D
isgoingtorain
What ______ at seven yesterday morning?
#38115
A
is she doing
B
was she doing
C
did she do
D
does she do
Great changes ______ in the city and a lot of buildings ______.
#42171
A
have taken place, have been set up
B
have been taken place, have been set up
C
were taken place, were set up
D
have taken place, set up