问题
With the help of the teachers and classmates, the boy worked hard and finally caught up with his classmates. Now he is _______ all the others.
A:as a good student as
B:as a student good as
C:as good a student as
D:as good as a student
B:as a student good as
C:as good a student as
D:as good as a student
正确答案是：
