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15.我们已5年没见面了.(It)
It has been three years since we met last time.

分析 It has been three years since we met last time

解答 It has been three years since we met last time
这是陈述的一个既定的事实,主句用现在完成时,从句用一般过去时.
since引导间状语从句时,主句多用现在完成时.It has been+一段时间+since…为一固定句型,表示自从…以来有多久了.

点评 熟悉常用句式的基本结构以及一些短语的搭配是解决此类题的关键.

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