John Snow found that the polluted water was for the outbreak of cholera.A. to blameB. to

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(答案→)A. to blame
B. to be blamed
C. blamed
D. blaming
解析：句意：John Snow发现受污染的水是此次霍乱爆发的罪魁祸首（应该对此次霍乱的爆发负责）。sb/sth be to blame for sth是一个固定短语，“某人/某事应为某事负责”的意思，用主动的形式表达被动的含义，不能用被动语态。故选A。