All possible means ______. However, nothing can _____ his wife dying of lung cancer.
A．has tried; stopB．have tried; keep
C．have been tried; preventD．has been tried; stop
C
名詞用法以及動詞用法。Means方法，是一個單復(fù)數(shù)同名名詞，前面有all說明本句中的means是復(fù)數(shù)，謂語動詞用復(fù)數(shù)形式且應(yīng)該使用被動。Prevent sb from doing sth阻止某人做某事。句意：所有可能的方法都已經(jīng)被嘗試過了。然而，沒有什么能阻止她的妻子死于癌癥。
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