it is 600 years since the first clock with a face and an hour hand was made.中since能换成before吗?
it is 600 years since the first clock with a face and an hour hand was made.中since能换成before吗?
英语人气：725 ℃时间：2020-03-29 16:58:48
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不能.since指自从...,before指.之前.刚好相反
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