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( )2.It five years since he has left for Beijing.

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( )2.It five years since he has left for Beijing.
A. was B. have been C.is D.is going to be
为什么选C
( )2.It five years since he has left for Beijing.
从since引导的的时间状语从句看,主句应该选has been.可是句中并没有这个选项,那就只能选C。因为be本身就可以表示结果或状态。
实际上:It is +时间段 since +从句= It has been +时间段 since +从句。