Doing和-ed 做定语 一 把下面定语从句简化成短语 (动词ing和ed 做定语 4 The scientists who are researching the causes of cancer are making progress. 5 Our school has a library which was built in 1900. 6 The car which caused the accident drove off.
4 The scientists researching the causes of cancer are making progress. 5 Our school has a library built in 1900. 6 The car caused the accident drove off.本回答被网友采纳