After the flood,two-thirds of the house_______ 为什么用need repairing?

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Aftertheflood,two-thirdsofthehouse_______为什么用needrepairing?Aftertheflood,two-thirdsofthehouse_______

After the flood,two-thirds of the house_______ 为什么用need repairing?
After the flood,two-thirds of the house_______ 为什么用need repairing?

After the flood,two-thirds of the house_______ 为什么用need repairing?
need sth./doing
= need to be done
需要什么/需要做什么
句意:洪水过后,三分之二的房屋需要修建.

need 接动名词主动形式,表示被动意义,这时动名词和主语之间有动宾关系, need doing 也可转换为 need to be done 结构,意思相同的。
你原句中的need reparing 也可改为need to be repared. need这个词的用法也稍微有点特殊。

翻译:洪涝后,有三分之二的房子需要被修理。

need repairing 是need + v-ing 结构,表示“需要被...”,本身有被动的意思,所以用need repairing。