20.You have to have a good preparation for the exam you can do well in it.A. in order to B

问题补充：

20.You have to have a good preparation for the exam you can do well in it.

A. in order to

B. such that

C. such as

D. so that

答案：

A. in order to

B. such that

C. such as

(答案→)D. so that

解析：DABBC