The factory ______ its waste into the river, but now it deals with the waste in a new way.
A．used to dumpB．is used to dumpC．used to dumpingD．is used to dumping
A
考查used to的用法。句意“工廠過(guò)去常常把廢水排進(jìn)河里，但是現(xiàn)在，它用一種新的方法來(lái)處理廢水。”used to do sth.“過(guò)去常常做某事”；be used to doing sth.“習(xí)慣于做某事”；sth. be used to do sth./for doing sth.“某物被用來(lái)做某事”；sth. be used as...“某物被用作......”。故選A。
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