It’s reported that in the past 50 years around 80 percent of Beijing’s courtyard houses ______.
A．had wiped outB．have wiped out　
C．have been wiped out　D．had been wiped out
C

試題分析：考查時態(tài)及語態(tài)。根據(jù)句中的時間狀語in the past 50 years在過去的50年，故用現(xiàn)在完成時。再根據(jù)courtyard houses與wipe out為被動關(guān)系，故用被動語態(tài)。句意：據(jù)報道，在過去的50年中，大約80的北京四合院被摧毀。故C正確。
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