作业帮单选 it is 30 years ____we last met.句型it is ……since 和it is~before 这两个句型怎么区分
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单选 it is 30 years ____we last met.句型it is ……since 和it is~before 这两个句型怎么区分
单选 it is 30 years ____we last met.句型it is ……since 和it is~before 这两个句型怎么区分
单选 it is 30 years ____we last met.句型it is ……since 和it is~before 这两个句型怎么区分
自从我们上次见面以来已经30年了.（从过去那次见面 到现在为止 30年了）
上次见面 是在 过去,since 从句用一般过去时.is,还可以变为 has been
如果用before,构成：It is +时间段+before...的句型
意思是,要过30年我们才能再次见面.before 从句中应用将来时.
it is +时间段+since 自从（过去某个动作）到现在为止多长时间了.
it is+时间段+ before 要（多久）才.
填since。
自从我们上次遇到已经有30年了。
这两个句型区别就是since 和before的区别。
一个是since是自从是……
一个是before在什么之前。
单选 it is 30 years ____we last met.句型it is ……since 和it is~before 这两个句型怎么区分
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