we often shake hands when i----- to each other

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weoftenshakehandswheni-----toeachotherweoftenshakehandswheni-----toeachotherweoftenshakehandswheni--

we often shake hands when i----- to each other
we often shake hands when i----- to each other

we often shake hands when i----- to each other
introduced
介绍,因为是被介绍的,因此加ed
当介绍给别人的时候我们经常握手