-- I have got a headache. -- No wonder. You_________ on the math exercises too long.
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A
work
B
are working
C
have been working
D
worked
推荐题目
Mary has __________ herself __________ for the party.
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A
held; up
B
attended; to
C
done; up
D
turned; up
Barrack Obama __________ President of the United States since 2010.
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A
became a
B
has become a
C
has turned
D
has been
— Alvin，are you coming with us?—I'd love to，but something unexpected ________.
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A
has come up
B
was coming up
C
had come up
D
would come up
I want to buy that kind of cloth because I ________ the cloth_______ well.
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A
have told; washed
B
have been told; washes
C
have been told; is washed
D
was told; is washed