The report showed four out of 10 cities ______had poor drinking water standards.

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问题 The report showed four out of 10 cities ______had poor drinking water standards.

选项 A、looked
B、surveyed
C、prepared
D、measured

答案B

解析这道题要求选择能够修饰cities并且符合句意的分词。从句意上讲， “受调查的10个城市中的4个”最为切题，因此(B)项是正确的。

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