第14题: [单项选择]There is a better chance of success if the animal is undamaged when ______, so it’s wise to look for cuts and splits of any kind, and reject animals that show them. A. purchasing B. purchased C. to purchase D. be purchased 参考答案:B 答案解析:句中需要一个过去分词，因为动词purchase和相关名词短语the animal在逻辑语义上是一种动宾关系，when purchased=when it is purchased，因为主语一致，可以省
