MSCDEX程序的作用是（）
A.使光驱能够被访问
B.使光驱能在DOS下访问
C.扩展光驱的功能
D.以上都是
参考答案：B
— Did you enjoy yourself at the party?
— Yes. I've never been to _____ one before. [ ]
A. a more excited
B. the most excited
C. a more exciting
D. the most exciting
A．I= ，从上向下
B．I= ，从上向下
C．I= ，从下向上
D．I= ，从下向上
