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
There ______ a funny cartoon on CCTV 6 this evening.
#36953
A
will
B
will have
C
is going to be
D
is going to have
The boy fell asleep where he ______,without undressing. 
#63710
A
was laying
B
was lying
C
had laid
D
had lied