It (be)five years since I (ride)a bike.

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It      (be)five years since I     (ride)a bike.

It (be)five years since I (ride)a bike.
It (be)five years since I (ride)a bike.

It (be)five years since I (ride)a bike.
是填恰当形式吧.
It has been five years since I rode a bike.

It has been five years since I rode a bike.

它 (是) 我 (乘坐) 后五年一辆脚踏车