《进口废物批准证书》实行“非一批一证”制度。 ( )
参考答案:对
管道运输业统计分别由中国石油化工集团公司、中国石油天燃气集团公司及其他相关部门负责。()
I first met Lisa three years ago. She _____ at a shop at the time.
A.has worked
B.was working
C.had been worked
D.had worked