题目内容
【题目】Our have been polluted by waste from factories. (river)
【答案】rivers
【解析】句意：我们的河流已经被来自工厂的废水污染了。根据谓语动词have been polluted可知，主语是复数，根据题意，故填rivers。
练习册系列答案
相关题目
题目内容
【题目】Our have been polluted by waste from factories. (river)
【答案】rivers
【解析】句意：我们的河流已经被来自工厂的废水污染了。根据谓语动词have been polluted可知，主语是复数，根据题意，故填rivers。