15．我們已5年沒見面了．（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
這是陳述的一個既定的事實，主句用現(xiàn)在完成時，從句用一般過去時．
since引導間狀語從句時，主句多用現(xiàn)在完成時．It has been+一段時間+since…為一固定句型，表示自從…以來有多久了．

點評 熟悉常用句式的基本結構以及一些短語的搭配是解決此類題的關鍵．

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