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问题: 有一事相求。

在什么情况下 ,be词后面可以用becourse引导的从句

解答:

should be because
For example:
It is getting warmer year by year.
That is because we don't take care of environment.

应该是because吧
举例:
天气一年比一年热。
那是因为我们没有保护好环境。