固定的一种结构：it is+ 一段时间 since +句子
翻译：距离.已经有.时间
since的用法比较特殊,一般主从句之间要前后照应,比如说:He said he went to Shanghai yesterday.但since不同,它的前后是不一样的,所以做题可以据此来选择.
it is five years since we began learing English 为什么不是it was
it is five years since we began learing English 为什么不是it was
英语人气：657 ℃时间：2019-08-21 02:11:18
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