2. 专升本
  3. The reason why the water in this area had been polluted was the ______ (poison) substances had been poured into the river.

The reason why the water in this area had been polluted was the ______ (poison) substances had been poured into the river.

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问题 The reason why the water in this area had been polluted was the ______ (poison) substances had been poured into the river.
选项
答案poisonous
解析
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