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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MaryandKtty_____(know)eachotherforalongtime.横线上添什么时态是haveknown吗?MaryandKtty_____(know)eachotherforal

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