the important documents were needed .
A. Where; finding
B. What; found
C. When; to find
D. When; to be found
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(答案→)A. Where; finding
B. What; found
C. When; to find
D. When; to be found
解析：本句可改写为：we needed finding the important documents in some places.将其变成被动语态，再就地点状语提问就得到：the important documents were needed finding in some places.----where the important documents were needed finding?由此可知选A。