It fifteen years since I to school
问题描述：
It fifteen years since I to school
A.was,come B.is,came C.is,have come D.was,have come
It后面和I后面有空
答
B 对,即：
It（is )fifteen years since I ( came )to school
分析 ：IT 'S +一段时间+ SINCE +从句（ 要用过去时）
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