题目内容：
Questions 21--30Read the article below about negotiations.
Choose the correct word or phrase to fill each gap from A, B, C, or D.
For each question 21--30, mark one letter (A, B, C, or D) on your Answer Sheet.
There is an example at the beginning, (0).
根据以上资料请回答第21题：_________
参考答案：
答案解析：