题目内容：
20___________
参考答案：
答案解析：
单选题：20___________
- 题目分类：中级
- 题目类型：单选题
- 查看权限：VIP
21题选择__________
21题选择__________A．give some advice B．refuse a invitation C．charge for the sewice
In this part of the test，you are asked to give a short talk
In this part of the test，you are asked to give a short talk on a business topic．
39__________
39__________
36__________
36__________
3._________
3._________