I have to see the doctor because I         a lot lately.
#102282
A
have been coughing
B
had coughed
C
coughed
D
cough
推荐题目
All that can be eaten _______ eaten up. 
#104878
A
are being
B
has been
C
had been
D
have been
Bob ________ with us together since he came to our school.
#101237
A
have worked
B
has worked
C
worked
D
will work
 Various efforts over the centuries _________ to predict earthquakes to reduce the damage. 
#99978
A
are being made
B
have been made
C
were made
D
were being made