初二英语问题（单选）

1.Miss Yang must be in the school library,____ she?
A.can't B.isn't C.needn't D.doesn't

2.I bought the dictionary ___ 15 yuan.
A.with B.at C.in D.for

3.______________is the top student in your class？
A. Whom do you think
B.Do you think who
C.Who do you think
D.Do you think whom
附：要说明理由，有悬赏分

1.选B就不说了
2.应该是for，buy sth. for sm.买某物用了多少钱
3.选C，变为陈述句应该是I think xxx is the top student in your class.
显然是对xxx划线提问，这里xxx做从句的主语，变反义疑问句，特殊疑问词who提前,后面接陈述句语序Who do you think is the top student in your class?
如果xxx做从句的宾语，则应该是Whom do you think the top student in your class is?或Whom do you think the top student is in your class?

1.C .must为情态动词，它的疑问句的肯定回答是：Yes，主格+must。。。否定回答是：No，主格+needn't。。。反意疑问句也是。
2.D.buy something for some money
意为 买某物用了多少钱
3.C.陈述句应该是I think sb is the top student in your class. sb为从句的主语,变疑问句who为疑问词,从句中的顺序是Who do you think is the top student in your class?

1.B 反意疑问句用be动词回答配合must be提问
2.C buy something in...花多少钱买什么
3.B 是常用句型，征询别人意见时常用，如：Do you think she is very beautiful? 你认为她非常漂亮吗？Do you think who is the most beautiful girl? 你认为谁是最漂亮的女孩儿？

1.B ;用must be提问，反意疑问句用be动词回答；
2.C ；buy something in...花...钱买什么
3.A ;疑问代词是做句子的宾语，要用宾格。

1B must be 猜测
2D buy sth for some money字典有例句