---I love the Internet. I’ve come to know many friends on the Net.

---_______ .Few of them would become your real friends.

A．That’s for sure.

B．It’s not the case .

C．I couldn’t agree more.

D．I’m pleased to know that.

对于国际合同当事人的缔约能力应适用的法律，在国际私法上有哪几种主要学说？