回应介绍

Pleased to meet you.= Glad to meet you.= Nice to meet you.
见到你真高兴。

I've heard so much about you.=I've heard too much about you.=I've often heard about you.
久仰大名。
A：I've heard so much about you．
久仰大名。
B：How nice to meet you.
见到你真高兴。

I'm pleased to make your acquaintance.
今日与您相见，三生有幸。
It's a pleasure to have finally met you.
久闻大名，今日相见，三生有幸。
acquaintance n. 相识，熟人
make one's acquaintance“结识某人”

Charmed.=A pleasure
幸会，幸会。
A：Very glad to see you．
见到你真高兴。
B：Charmed.
幸会，幸会。

I've been looking forward to meeting you.
我一直盼望着与你见一面。
A：I've been looking forward to meeting you.
我一直盼望若与你见一面。
B：I'm honored to see you．
很荣幸认识你。
“have+ been+动词ing形式”是现在完成进行时的基本构成，可表示动作从过去发生一直持续到现在。

I think we've met before.
我们以前见过面。
A: Let me introduce Jane.
我来介绍一下简。
B: I think we've met before.
我们以前见过面。