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__for several weeks,the city needed food.

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__for several weeks,the city needed food.
A.As having flooded B.being flooded C.Having been flooded D.To flood
__for several weeks,the city needed food.
for several weeks 是完成时的标志,所以答案必为完成时,排除了B、D
但因为city 是被水掩的,所以要用被动.
因此答案是Having been flooded
整句:Having been flooded for several weeks,the city needed food.
已经水淹了几周,这城市需要食物了.