Tom ________ in the library every night over the last three months.[ ]A. wor

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Tom ________ in the library every night over the last three months.[     ]
A. works
B. worked
C. has been working
D. had been working

答案

举一反三

We ________ on this project for four hours. Let"s have a rest.[     ]
A. are working
B. have been working
C. worked
D. had worked

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Kate ________ on her new novel, which is supposed to come out next month.[     ]
A. has been working
B. had worked
C. will be working
D. was working

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The temperature ________ to minus 3 in London and it is likely to get even colder as the day goes on.[     ]
A. will have fallen
B. had fallen
C. has been falling
D. falls

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The number of foreign students attending Chinese universities ________ rising steadily since 1990.[     ]
A. is
B. are
C. has been
D. have been

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Ever since my brother graduated from the university, he _______ in the present company for 15 years and he is now chief engineer of the company.   [     ]
A. worked
B. has been working
C. is working
D. works

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