◎ 题干
The fact suggested that the water _______ and to prevent this from happening again, John Snow
suggested that the source of all the water supplies ______.

[     ]

A. should blame; should be examined
B. was to blame; be examined
C. was blamed; were examined
D. was to be blamed; should examine
◎ 答案
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◎ 解析
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◎ 知识点
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