It______five years since he has left for Beijing.

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It______fiveyearssincehehasleftforBeijing.It______fiveyearssincehehasleftforBeijing.It______fiveyear

It______five years since he has left for Beijing.
It______five years since he has left for Beijing.

It______five years since he has left for Beijing.
has been

It_has been_____five years since he has left for Beijing.

口语用is
书面语用has been
都对!

It___has been___five years since he has left for Beijing.
从他离开去北京已经有5年了。