He works as an engineer now, but he _______ on a farm for three years.

　 A．has worked B．worked　　　 C．was working D．had worked

短文改错

Nobody likes staying at the home on a public holiday,　　　　　　　　　　　　　　　　　　 1.______

specially, if the weather is fine. Last August we decided　　　　　　　　　　　　　　　　　　　　 2.______

to spend on the day in the country. The only difficulty　　　　　　　　　　　　　　　　　　　　   3.______

was that million of other people had just the same idea.　　　　　　　　　　　　　　　　　　　　  4.______

We moved out of the city slowly behind a long line　　　　　　　　　　　　　　　　　　　　　　   5.______

of cars, as at last we came to a quiet country road　　　　　　　　　　　　　　　　　　　　　　　　　　   6.______

and, after some time, stopping on a farm far from the　　　　　　　　　　　　　　　　　　　　   7.______

town. We had been brought plenty of food with us　　　　　　　　　　　　　　　　　　　　　　   8.______

and we took them out of the car. Now everything was　　　　　　　　　　　　　　　　　　　　　　　　 9.______

ready, so that we sat down near a path at the foot of a hill.　　　　　　　　　　　　　　　　    10._____

Nobody likes staying at the home on a public holiday,　　　　　　　　　　　　　　　　　　 1.______

specially, if the weather is fine. Last August we decided　　　　　　　　　　　　　　　　　　　　 2.______

to spend on the day in the country. The only difficulty　　　　　　　　　　　　　　　　　　　　   3.______

was that million of other people had just the same idea.　　　　　　　　　　　　　　　　　　　　  4.______

We moved out of the city slowly behind a long line　　　　　　　　　　　　　　　　　　　　　　   5.______

of cars, as at last we came to a quiet country road　　　　　　　　　　　　　　　　　　　　　　　　　　   6.______

and, after some time, stopping on a farm far from the　　　　　　　　　　　　　　　　　　　　   7.______

town. We had been brought plenty of food with us　　　　　　　　　　　　　　　　　　　　　　   8.______

and we took them out of the car. Now everything was　　　　　　　　　　　　　　　　　　　　　　　　 9.______

ready, so that we sat down near a path at the foot of a hill.　　　　　　　　　　　　　　　　    10._____

He works in a factory now , but he ______ on a farm for 20 years.

[　　]

Henry works as a teacher now, but he ____ on a farm for three years.

　 A. has worked　 B. had worked C. had been working　 D. worked