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1972年，海牛被发现濒临灭绝，因为一些沼泽地已经被污染。它们重达200磅。 In 1972,it was found that they —— —— because some of the swamps —— —— —— They —— about200 pounds in—— answer;were endangered have become pollued are weight 海牛濒临灭绝是客观事实，不应用一般现在时吗 能写have been polluted吗，
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解题过程：
1972年，海牛被发现濒临灭绝，因为一些沼泽地已经被污染。它们重达200磅。
In 1972,it was found that they —— —— because some of the swamps —— —— —— They —— about200 pounds in——
answer;were endangered have become pollued are weight
海牛濒临灭绝是客观事实，不应用一般现在时吗
能写have been polluted吗，
答：此处不能用一般现在时，因为此句前有一个表示过去的时间状语in 1972.
"因为一些沼泽地已经被污染。"可以翻译为：because some of the swamps have been polluted .
最终答案：略
解题过程：
1972年，海牛被发现濒临灭绝，因为一些沼泽地已经被污染。它们重达200磅。
In 1972,it was found that they —— —— because some of the swamps —— —— —— They —— about200 pounds in——
answer;were endangered have become pollued are weight
海牛濒临灭绝是客观事实，不应用一般现在时吗
能写have been polluted吗，
答：此处不能用一般现在时，因为此句前有一个表示过去的时间状语in 1972.
"因为一些沼泽地已经被污染。"可以翻译为：because some of the swamps have been polluted .
最终答案：略