题目内容
【题目】All possible means _______. However, nothing can _______ him dying of lung cancer.
has tried; stop
have tried; keep
has been tried; prevent
have been tried; stop
【答案】D
【解析】第一空主语means是单复数同形的名词,有all修饰,谓语用复数,且用被动语态;第二空用stop, stop sb. (from) doing阻止某人做某事。
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