Every means _____ prevent the water from _____.
A．a(chǎn)re used to; pollutingB．will be used to; polluting
C．is used to; pollutedD．is used to; being polluted
D

試題分析：句意：為了防止水被污染，每一種方法都被試過了。Means:方式，方法。這個單詞是單復數(shù)同形，因此要由其前面的定語決定它是單數(shù)還是復數(shù)，由every可知謂語動詞要用單數(shù)，故排除A。又因為water與污染pollute之間構(gòu)成被動關(guān)系，排除B；再由from為介詞，后要加being done才可構(gòu)成被動，排除C，故答案選D。
點評：要注意記憶一些特殊的名詞的用法，如：fish魚，deer鹿，sheep綿羊，works（工廠）等。
即學即練：Every means ______ tp prevent the air pollution, but the sky is not still clear.
A.     is used  B. are used  C, has been used  D. have been used 答案：C。
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