Surface water was sampled bi-monthly over a one-year period at seven sites ______evenly over the area.

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问题 Surface water was sampled bi-monthly over a one-year period at seven sites ______evenly over the area.

选项 A、disperse
B、dispersal
C、dispersed
D、dispersion

答案C

解析 evenly over the area是修饰前面seven sites的形容词性短语。因此空格内应该填人一个分词，(C)最为合适。由此可见在这种情况下分词前面<主格关系代词+be动词>可以省略。

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