单项选择题


Questions 18 to 20 are based on the following passage. At the end of the passage, you will be given 15 seconds to answer the questions.
Now listen to the passage.
According to the passage, what would good negotiators do

A.Study the case carefully beforehand.
B.Stick to a set target.
C.Appear friendly to the other party.
D.Try to be flexible about their terms.