题目内容
John Snow found the source of the water came from the river ________ by the dirty water from London.
[ ]
A.to be polluted
B.polluted
C.having polluted
D.was polluted
答案:B
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题目内容
John Snow found the source of the water came from the river ________ by the dirty water from London.
A.to be polluted
B.polluted
C.having polluted
D.was polluted