47. She wrote a letter to her father, ______ she made her secret known.

A. which B. that C. in which D. where

46. China has hundreds of islands, ______ we all know.

A.in which　 B. at which

C. of which　 D. which

45. Rober is good at language, ______ we all know.

A. because B. for 　C. as 　　D. since

44. Don’t do such things ______ you are not sure about.

A. that　 B. which 　C. as D. what

43. The professor has two sons, ______ are teaching in the same university.

A. neither of them　 B. either of them 　　

C. both of them 　 D. both of whom

42. Don’t trust such men ______ over praise you to your face.

A. as 　B. that C. who 　　D. which

41. The factory ______ I am going to is the place ______ my mother used to work many years ago.

A. where, where 　　　　 B. where, which 　

C. which, where 　 D. that, which

40. The Summer Palace is one of the most beautiful parks ______ built in the Qing Dynasty.

A. where were　　 B. where was 　　

C. that were 　　　 D. which was

39. The last river ______ they crossed is two miles wide.

A. where　 B. which C. that 　D. in which

38. The place ______ you are going to visit is the ruin of a place.　

A. in which B. at which C. where 　D. which