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because和asit'ssoexpensice,Idon'tthinkweshallbuyit.这里是用because好还是as好?还有当as作因为讲时,这两个词有什么区别?请说得清楚一点,不要太含糊.

题目详情
because和as
_____it's so expensice,I don't think we shall buy it.
这里是用because好还是as好?
还有当as作因为讲时,这两个词有什么区别?请说得清楚一点,不要太含糊.
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答案和解析
because,as是放在句中,because一般放在句前