【单选题】

{{I}}{{B}}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.{{/I}}{{/B}} 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.