As a result of the serious earthquake,two-thirds of the buil

As a result of the serious earthquake,two-thirds of the buildings in Wenchuan__________.As a result of the serious earthquake,two-thirds of the buildings in the area .As a result of the serious earthquake,two-thirds of the buildings in Wenchuan________.A.need repairing B.needs to repair C.needs repairing D.need to repair 为什么选A?请说明清楚,