it's a long time since Hong Kong(come)back to China用come 的适当形式填空

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it''salongtimesinceHongKong(come)backtoChina用come的适当形式填空it''salongtimesinceHongKong(come)backtoChina用c

it's a long time since Hong Kong(come)back to China用come 的适当形式填空
it's a long time since Hong Kong(come)back to China
用come 的适当形式填空

it's a long time since Hong Kong(come)back to China用come 的适当形式填空
came
since后接动词过去式表示自从某事发生已经很长时间了.
这是一个现在完成时语态