16. ________ many times, but he still couldn't understand it.

A. Having been told　　   B. Though he had been told

C. He was told　　   D. Having told

60.The door of the shop remained ________ , though it was ten o'clock am.

57.Mrs Brown was much disappointed to see the washing machine she had ________ went wrong again.

52.I arrived just in time ________ the police beating the thief.

A. seeing　　　　　　　　　　    B. to see　　　　   

C. in order to see　　　　　　　　　　    D. to have seen

50.Everyone had a form in his band, but no one knew which office ________ .

A. to send it to　　　　　　　　　　    B. to send it　　  

C. to be sent to　　　　　　　　　　    D. to have it sent

49.We think the electronic computer ________ one of the most useful tools in use today.

19.[2002全国] —You haven't said a word about my new coat, Brenda. Do you like it?

—I' m sorry I ________ anything about it sooner. I certainly think it's pretty on you.

14.He remained silent until he ________ .

12.They would have finished building the bridge without the rain, but it ________ for a whole month.

A. rained  B. had rained  C. has rained  D. had been raining

10.—You were always forgetting things.

—Oh, no, I only ________ to take a book.