for several weeks，the city needed food.
A. As having flooded
B. Being flooded
C. Having been flooded
D. To flood
网友回答
A. As having flooded
B. Being flooded
(答案→)C. Having been flooded
D. To flood
解析：the city与flood间为被动关系。flood的动作发生在need之前，因此本空用现在分词被动语态的完成式，而不可以是过去分词。