求讲几道英语选择!

题目

求讲几道英语选择!
1.(C)I'm only a biginner on the instrument,and ____ will be years before I'm ready to play in public.
A.that B.there C.it D.which
为什么不能选there?这里不是there be 句型么?
2.(C)---Where did you get your MP3 player?
---It's from my boyfriend,if you _____ know.
A.can B.may C.must D.will
3.(B)---Who is that at the door?
---___________.
A.Don't you think it's him B.A man calling himself Mr.Baker
C.Welcome,Mr.Baker D.Sorry,maybe it's Mr.Baker
能选D么?

答案

1 不是there be句型,there be一般接实体东西,看得见或者摸得着的 这个句子后面的"years",说的是时间,所以就用"it"做主语
2 "if you must know"意思是"如果你非要知道的话",而且ABD放到句中也说不通
3 问题是问"那个门边的人是谁",而不是问"你知道门边的人是谁吗" 如果不知道的话,直接回答"I don't know"更合适