this is ...和it is...的区别

this is ...和it is...的区别 this is 和it is的区别 this is 和 it is 的区别 this is it 和is this it的区别 what is it 和what is this的区别是什么? This开头和 It is开头用法的区别 this is和here is的区别 this is和this are的区别 it和is的区别 this is Mary speaking和it is Mary speaking这两种电话用语的区别 Is this car 和 Is this the car 的区别 It's和Is it的区别