--Who's this?--( ) is Lucy.下面四项选什么?为什么?This/It/That/She

--Who's this?--( ) is Lucy.下面四项选什么?为什么?This/It/That/She 英语选择题：Who's that? ( ) is Lucy. A This B It C That D She's -----who's that? ------_______is Lucy.下面四个选项选哪个?为什么 A.This B Who's that at the door?____ is the postman.A.She B.This C.It It ( ) this cap is lucy's --whose watch is this ?---【 】,回答为什么不能是this is lucy‘s 而是it is Who's that girl ___ my sister A This is B She is C It's D Th who is that和who's this 1.Is this Lucy's eraser?No,it's not_____.A.she B.hers C.her 6.__ Is this yellow skirt yours ,Lily __No,it's Lucy's .That -who's that over there?-It's Lucy's sister.这里回答为什么要用It's She who is that?A.That's a student B.It's Bob C .This is Bob