作业帮the teacher told us that pollution (is) a serious problem in the world.为什么括号里不能改成had been
来源：学生作业帮助网 编辑：作业帮 时间：2024/11/26 09:42:37
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the teacher told us that pollution (is) a serious problem in the world.为什么括号里不能改成had been
the teacher told us that pollution (is) a serious problem in the world.为什么括号里不能改成had been
the teacher told us that pollution (is) a serious problem in the world.为什么括号里不能改成had been
科学事实和现实的东西是不受过去时态的改变而改变的,污染在当今世界是个很严重的问题这是事实,要用一般现在时
had been是现在完成时，但 pollution现在还存在，所以用一般现在时就可以了。
had been是过去完成时,使用时必须句中出现一个表过去的词才行,也就是说要有时间说明是表过去的过去
因为污染严重是一个客观存在的事实，就要用一般现在时。
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