Every means ______ tried but without much result.
A．has beenB．have beenC．a(chǎn)reD．is
A
考查主謂一致。Means，方式，方法，是單復(fù)數(shù)同形的詞，謂語(yǔ)動(dòng)詞的單復(fù)數(shù)要根據(jù)means的單復(fù)數(shù)確定；因?yàn)槭荅very means，每種方式，所以謂語(yǔ)動(dòng)詞用單數(shù)；且根據(jù)句意，每種方式已被試過(guò)，但沒(méi)有多大效果。所以用現(xiàn)在完成時(shí)態(tài)。選A。
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