[Ask ] What is the tense of this sentence?

作者: maxqq (max)   2019-08-02 16:29:36
=== It has been a pleasure doing business with you.===
Is this sentence a "Present perfect continuous tense"?
Why not is "Present perfect tense"?
If this is,
Why could use this sentence on this occasion?
Thanks
作者: afterjump (AF)   2019-08-04 11:45:00
have p.p. +being= present continue perfect tense

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