问题补充：
As a result of the serious flood, two-thirds of the buildings in the area .
A. need to repair
B. needs to repair
C. needs repairing
D. need repairing
答案：
A. need to repair
B. needs to repair
C. needs repairing
(答案→)D. need repairing
解析：由于后半句的two-thirds 接的名词the buildings作主语，the buildings是可数名词，因此谓语用复数，故排除BC选项。且need在这里作为特殊的及物动词，其后面的宾语用动名词的主动式表示被动或者用不定式的被动式：need doing=need to be done。句意：因为严重的洪水，这个地区三分之二的房子受到破坏需要进行修建。
