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

解析試題分析：be used to sth習慣于某事;used to do sth過去常常做某事. sth be used to do sth某物被用來做某事。句意:這個工廠過去常常把廢水泄入河中,但是現(xiàn)在它用一種新方法處理廢水.結(jié)合語境可知選A.
考點：used的用法
點評：used to的用法比較固定，需要注意的是used to do表示過去常常做某事，be used to表示習慣于某事。前者to是不定式符號，后接動詞原形。后者to是介詞，后接名詞或者名詞性短語。Used to do結(jié)構(gòu)中use相當于行為動詞，有詞形變化。Be used to中used相當于形容詞，無詞形變化。

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