Every means     , but none proved      .
A．have tried; a successB．have been tried; successful
C．has tried; to be successfulD．has been tried; successful
D

試題分析：考查主謂一致：means是單復(fù)數(shù)同形的名詞，單復(fù)數(shù)取決于修飾詞，這句話means用every修飾，說明是單數(shù)，謂語用單數(shù)，而且means和try是被動關(guān)系，用has been tried，第二空的prove是連系動詞，后面接形容詞做表語。句意：每種辦法都被嘗試過了，但沒有一個證明是成功的。選D。
點評：主謂一致的考點較多，要在理解的基礎(chǔ)上加以記憶，多練習(xí)加以鞏固。這里的單復(fù)數(shù)同形的單詞一定要看修飾詞來判斷。
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