2. 外语
  3. The substance ______ easily through groundwater, and some communities have experienced acute episodes of water pollution after u

The substance ______ easily through groundwater, and some communities have experienced acute episodes of water pollution after u

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问题 The substance ______ easily through groundwater, and some communities have experienced acute episodes of water pollution after underground storage tanks ruptured.
选项 A、perfuses
B、perscusses
C、percolates
D、perforates
答案C
解析 C选项是个超纲词汇，有时需要语感的判断。
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