-- I have got a headache. -- No wonder. You_________ on the math exercises too long. 
#63776
A
work
B
are working
C
have been working
D
worked
推荐题目
He complained that this was the third time he            of the changes of the meeting date.
#63781
A
would be informed
B
was informed
C
has been informed
D
has been informed
In the last few years thousands of films ____ all over the world.
#63784
A
have produced
B
have been produced
C
are producing
D
are being produced
Because of the bad weather, my mother ____ and lay in bed. She ______ for a week. 
#63793
A
has been ill; was ill
B
fell ill; has fallen ill
C
fell ill; has been ill
D
fell ill; is ill
When to go for the on-salary holiday          yet?
#63766
A
are not decided
B
have not been decided
C
is not being decided
D
has not been decided
—Look! Someone ________ the floor.—Well, it wasn't me. I went shopping just now.
#63763
A
had swept
B
has swept
C
was sweeping
D
is sweeping