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
-What’s his brother?-He is a teacher.He__________ maths at a school.
#41570
A
taught
B
has taught
C
teaches
D
will teach
Jeremy Lin __________ an unknown basketball player in New York Knicks for quite a long time.
#40498
A
used to be
B
used to being
C
is used to be
D
was used to be
My life ______a lot in the last five years. 
#38361
A
havechanged
B
haschanged
C
changed
D
willchange