3．A。前者问：“开车去市区很难吗?”后者说：“是的，那就是我坐火车去上班的理由。”显然坐火车去上班的动作发生在过去持续到现在并将持续下去，应用现在完成进行时。

2．B。表示一个推测。排除A、C，因为A、C用的是过去时，而D项will be和后面的going to重复，所以选B。

1．C。was表示“他过去一直是这样”，但现在不是了。

60. ―If the traffic hadn’t been so heavy, I could have been back by 6 o’clock.

　 　―What a pity! Tina _______ here to see you.

　　 A. is　　　　　　　 　　　　　　 B. was

C. would be　　　　 　　　　　　 D. has been

[答案解析]

59. When the old man _______ to walk back to his house, the sun ________ itself behind the mountain.

　　 A. started; had already hidden　　　　 B. had started; had already hidden

　　 C. had started; was hiding　　　　　 D. was starting; hid

58. ―Hurry up! Alice and Sue are waiting for you at the school gate.

　 ―Oh! I thought they ________ without me.

　　 A. went　　　　　 　　　　　　　 B. are going

C. have gone　　　 　　　　　　　 D. had gone

57. ―What are you going to do this afternoon?

　 　―I am going to the cinema with some friends. The film ________ quite early, so we _____ to the bookstore after that.

　　 A. finished; are going　 　　　　　　　　 B. finished; go

C. finishes; are going　 　　　　　　 D. finishes; go

56. ―What’s wrong with your coat?

　 　―Just now when I wanted to get off the bus, the man next to me ________ on it.

　　 A. sat　　　　　　 　　　　　　　 B. had sat　　

C. had been sitting 　　　　　　　　　　 D. was sitting

55. ―Are you still busy?

　 ―Yes, I ________ my work, and it won’t take long.

　　 A. just finish　　　　　　　　　　 B. am just finishing

C. have just finished　　　　　　　 D. am just going to finish

54. You ________ to leave until you _______ your work.

　　 A. won’t be allowed; have finished　　 B. won’t allow; finish

　　 C. won’t be allowed; will finish　　　 D. won’t allow; will finish