flashfxp怎么上传网站:it's是否等于it is 或it was

it's是否等于it is 或it was it's 是等于it is或 it was,还是二者都可? It`s() today. I think it is going to () 选择题 It's getting dark.中的It's 是否是It is ？句中哪个是系动词？ What is this ? It's a_ It is Lucy's dictionary. I don't know ( ) book it is. A.who B.who's C.whose I think it's only fair It's black,but you say it's cleam.It's white,but say it\'s not clean.what is it? It's black,but you say it's clean .it's white ,but you say it's not clean. What is it?