问题补充:
34. 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. had been wiped out
D. have been wiped out
答案:
A. had wiped out
B. have wiped out
C. had been wiped out
(答案→)D. have been wiped out
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