It’s reported that in the past 50 years around 80 percent of Beijing’s courtyard houses ______.
| A．had wiped out | B．have wiped out |
| C．have been wiped out | D．had been wiped out |
45. The population of China ______ to many times what it was in 1949, and most of its population ______ farmers.
| A．have grown; are | B．has grown; are | C．has grown; is | D．have grown; is |
44. Please tell me ______ you would like to have your coffee --- black or white?
| A．how | B．what | C．when | D．Which |
43. ______ he was absent, I was expected to take his place greatly surprised me, for I didn’t have much experience.
| A．If | B．If that | C．That if | D．That |
42. You’d better start it right away ______ you forget it.
| A．in case of | B．unless | C．before | D．Since |
41. If it ______ for the fence, he ______ into the river.
A. were not; fallenB. had not been; could have fallen
C were not; could fall D. had not been; could fall