题目内容

Every means ______ tried, yet no result ______encouraging up to now.
A．have been ...is B．has been...has beenC．have ...has been D．has...is
B
考查时态及主谓一致。句意：每一种方法都试过了，到目前为止还没有令人鼓舞的结果。结合语境可知前文描述的是现在已经完成的动作，故用现在完成时态。主语为抽象名词不可数，故谓语动词用单数。下文根据时间状语可知也是现在完成时态，主语result同样是抽象名词，故谓语动词也用单数，选B。
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