跪求正解,this,that,或those,these时,附加疑问句中主语用it和they.但是如果我的句子是：this is tom,后边是用isn't it?还是isn't he?请求各位高人知道!

跪求正解,this,that,或those,these时,附加疑问句中主语用it和they.但是如果我的句子是：this is tom,后边是用isn't it?还是isn't he?请求各位高人知道! 单项选择Who' that at the door?-____is maryA.It B.He C.her D.This求正解 原因 求正解 求正解. 求正解. 求正解, 求正解. 求正解, 求正解 求正解. 求正解 求正解! Is this the hospital（ ）you visited yesterday.A what B that C where D the one求此题正解...为什么书上的正确答案是D呢？ how about that cold one you promised me?求正解 Somewhat felt that the word language cannot express 求正解 Tell somebody about this ,Linda（改为否定句） _____tell _____about thos ,Linda 求解答,求正解 求第七题正解