Mary and Ktty_____(know)each other for a long time.横线上添什么时态是have known吗?

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Mary and Ktty_____(know)each other for a long time.横线上添什么时态是have known吗?
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Mary and Ktty_____(know)each other for a long time.横线上添什么时态是have known吗?
Mary and Ktty_____(know)each other for a long time.横线上添什么时态
是have known吗?

Mary and Ktty_____(know)each other for a long time.横线上添什么时态是have known吗?
have known
现在完成时

have known

i think should be,
have been knowing

know with