31.—Who is singing in the classroom — must be Susan .A.She B.It C.This D.He为什么选B?

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31.—Who is singing in the classroom — must be Susan .A.She B.It C.This D.He为什么选B?
31.—Who is singing in the classroom — must be Susan .A.She B.It C.This D.He
为什么选B?

31.—Who is singing in the classroom — must be Susan .A.She B.It C.This D.He为什么选B?
it在这里的用法是明确身份,比如打电话时用的it's Tom,和这种用法是一样的.类似的还有 Was it youwho put these books on my desk?

it 可指代人噢，由于未知性别可用it 代替噢，，详见it 的用法，

未知性别或未知情况下
就像电话用语问对方是谁时：Who is it?

B. It
一定是....= it must be.....

选择It
当不知对方性别或表示猜测时都用it

Everyone that I know who is like studying and singing in High School.请问这句哪错了 Who is singing in the classroom?I want to know合为一句 2.Who is singing there?( ) me.A.This B.That is C.It is D.I am who is singing over there?———— （）is my sister who is singing in the next room 为什么who 后面要跟 is singing? —Who’s singing over there — ________ is Sandy’s sister. Listen!Who ____?A.singing B.is sing C.is singing I think it is very easy ----(answer) this question.Please use this sentence pattern-----(write) five sentences.Do you know who--------?A.is singing B.is sing C.sings is D.singing is直接写答案,不要再复制一遍题! 31.—Who is singing in the classroom — must be Susan .A.She B.It C.This D.He为什么选B? listen!who is singing the song _____(happy) listen,who is singing in the classroom?变成 are Listen!Who is singing in the next room?这里为什么要用singing The girl which is singing is my sister 与The girl　who is singing is my sister都有么 I heard he is singing.是病句么?能不能改为I heard that he is singing. who over there now A,who over there now A,singing B,sing C,is singing 请问,问号选什么? ——Listen!Who is singing in the next room?——Gina _____.（完成对话）为什么? 1.Who’s singing over there — ________ is Sandy’s sister.A.That B.It C.She D.This i am who is