it is 600 years since the first clock with a face and an hour hand was made.中since能换成before吗?
问题描述:
it is 600 years since the first clock with a face and an hour hand was made.中since能换成before吗?
答
不能换的。意思不一样
答
不能换
答
不能.since指自从...,before指.之前.刚好相反