It’s reported that in the past 50 years around 80 percent of Beijing’s courtyard houses .

问题补充：

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

答案：

A. had wiped out

B. have wiped out

(答案→)C. have been wiped out

D. had been wiped out

解析：考查时态及语态。根据句中的时间状语in the past 50 years在过去的50年，故用现在完成时。再根据courtyard houses与wipe out为被动关系，故用被动语态。句意：据报道，在过去的50年中，大约80的北京四合院被摧毁。故C正确。