Will this fish keep until tomorrow?和The best time to make friends is before you need them.

Will this fish keep until tomorrow?和The best time to make friends is before you need them.

题目
Will this fish keep until tomorrow?和The best time to make friends is before you need them.
until和before 在此分别是 介词 还是 连词?怎么区别?
答案
举一反三
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