41．-Why do you look so worried?

-Fred left the company half an hour ago. His work _______ unfinished since.

A．left　　　 B．was left　　　 C．has left　　　 D．has been left

40. A new technique ____ out, the yields (收成) increased by 20% .

A. having working　　　　 B. having been working　

C. has worked　　　　　　 D. had been worked

39. ---What do you think of my suggestion?

--- Sorry. What's that? I ____ about something else.

A. thought B. am thinking　 C. was thinking D. had thought

38.--- Haven't I told you that I like the beef well done?

---Yes, but I _____ it longer than I usually do.

A. was cooking B.will cook　 C. cooked D. had cooked

37. I haven' t seen Mary these past few days. I m afraid she ____ herself for some time.

A. isn't feeling　　 B. hasn' t been feeling　　

C. hadn't been feeling　　 D. wasn't feeling

36. The truth, Sir, is that the old man____ across the street when my car hit him.

A. was to walk B. had been walkingC. walked D. was walking

35. Our TV sets sell well, but ten years ago no one could have imagined such a big share in the market that they ____.

A. were having　 B. had had　 C. were to have　 D. had

34. Our team was ahead during the first half, but we ________ in the last ten minutes.

A. had lost　　 B. would lose　　 C. were losing　　 D. lost

33. - Look! How long ________ like this?

　 -Three weeks! It’s usual here that rain _______ without stopping these days of the year.

A. has it rained; pours　　　　 B. has it been raining; pours

C. is it raining; is pouring　 D. does it rain; pours

32.-Have you heard that Tom,along with his parents,______to Japan?

-Really?No wonder I haven’t seen him these days.

A.has been　　　　　　　　　　 B.has gone　　　　　　　　　　 C.have been　　　　　　　　　 D.have gone