They ____ on this project for l 4 hours, but it’s so difficult to persuade the
题型:河北省模拟题难度:来源:
They ____ on this project for l 4 hours, but it’s so difficult to persuade them to have a rest. |
[ ] |
A. had worked B. have been working C. worked D. are working |
答案
B |
举一反三
— Jack, do you know anything about Doctor Brown? — I ______ to him for years. I don"t see how anyone else could do better. |
[ ] |
A. went B. will go C. had gone D. have been going |
— Have you watched the nine o"clock news? — No. I ______ my homework at home all the morning. |
A. had done B. have done C. did D. have been doing |
I have to see the doctor because I a lot these days. |
A. coughed B. am coughing C. have been coughing D. cough |
Although they __________ in love for over ten years, they haven"t decided when to get married. |
[ ] |
A. have fallen B. had fallen C. have been D. had been |
Liu Fang ______ pipa since she was six years old. |
[ ] |
A. played B. was playing C. had been playing D. has been playing |
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