题目

_______ for several weeks, the city needed food. A. As having flooded                       B. being flooded  C. Having been flooded                        D. To flood   答案： C   被水淹了几个星期， 这个城市需要食物。根据句意应用被动语态，“水淹”发生在“需要食物”之前，所以用having done.  

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