___that your sister?请问that前面用什么词

___that your sister?请问that前面用什么词 请问各位朋友：___that's important is that you are doing your best a Your sister have one?Your的前面应填什么 Is that ( ) your sister 对this、 that 、these、 those 、your sister提问的一般疑问句,一般用什么主语回答? { }does your sister draw the pictures?用什么提问词 对your sister 提问用什么 ：___that's important is that you are doing your best and mov ___that is important is that you are doing your best and mov your前面用什么be动词 is that your sister?应该怎样回答? Is that your sister?怎么回答