问题补充:
单选题Thefactory______itswasteintotheriver,butnowitdealswiththewasteinanewway.A.used to dumpB.is used to dumpC.used to dumpingD.is used to dumping
答案:
A解析考查used to的用法。句意“工厂过去常常把废水排进河里,但是现在,它用一种新的方法来处理废水。”used to do sth.“过去常常做某事”;be used to doing sth.“习惯于做某事”;sth. be used to do sth./for doing sth.“某物被用来做某事”;sth. be used as...“某物被用作......”。故选A。