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

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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,
需要被修 被动语态 用need的表现形式有两种
1 need to be done
2 need doing sth