-Hi，Tracy，you look tired.-I________the living room for three hours.[ ]A．pain

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-Hi，Tracy，you look tired.
-I________the living room for three hours.[     ]
A．paint
B．had painted
C．was painting
D．have been painting

答案

举一反三

The little boy ________  in the mud all the morning. No wonder he is dirty from head to foot.[     ]
A．has played
B．is playing
C．has been playing
D．was playing

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-That"s the third time he"s won the award in this field.
-Yes. He ________ his maximum potential in the past decade.[     ]
A．explored
B．is exploring
C．has been exploring
D．has explored

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I have to see the doctor because I ________ a lot lately.[     ]
A. have been coughing
B. had coughed
C. coughed
D. cough

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Joseph ________ to evening classes since last month, but he still can"t say "What"s your name?" in
Russian.

[     ]
A. has been going
B. went
C. goes
D. has gone

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—Those scientists invented a robot to care for kids!
—It"s not surprising. They ________ wonders all the time.[ ]
A. worked
B. were working
C. work
D. have been working

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