-- 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
Tom ________ in the library every night over the last three months.(2011·北京)
#63775
A
works
B
worked
C
has been working
D
had been working
In the last few years thousands of films ________ all over the world.
#63768
A
have produced
B
have been produced
C
are producing
D
are being produced
—I remember you were a talented pianist at college.Can you play the piano for me?—Sorry，I ________ the piano for years.(2012·湖南)
#63770
A
don't play
B
wasn't playing
C
haven't played
D
hadn't played
My study of biology has ______ much of my spare time, but it has given me a great deal of enjoyment.
#63787
A
taken off
B
taken down
C
taken up
D
taken away