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because和as

题目详情
because和as
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答案和解析
1)because语势最强,用来说明人所不知的原因,回答why提出的问题,是句子中的重要部分,常放在句末,不能用其它三个替换.逗号可加可不加.
You can trust those products because the quality never changes.
I haven't been to the cinema lately,because I am too busy.
I didn't go,because I was afraid.
2)当原因是显而易见的或已为人们所知,就用as或 since.since稍正式一些.
Since /As the weather is so bad,we have to delay our journey.