.

—May I see your ticket, please? I think you ________ in my seat.

—Oh, you’re right. My seat is upstairs. I’m terribly sorry.

A．are sitting

B．sit

C．sat

D．have sat

教师应具备使用、制作玩具的技能，在此基础上才能指导幼儿讨论玩具的特点、性能、玩法等。