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
考查時(shí)態(tài)及主謂一致。句意：每一種方法都試過(guò)了，到目前為止還沒(méi)有令人鼓舞的結(jié)果。結(jié)合語(yǔ)境可知前文描述的是現(xiàn)在已經(jīng)完成的動(dòng)作，故用現(xiàn)在完成時(shí)態(tài)。主語(yǔ)為抽象名詞不可數(shù)，故謂語(yǔ)動(dòng)詞用單數(shù)。下文根據(jù)時(shí)間狀語(yǔ)可知也是現(xiàn)在完成時(shí)態(tài)，主語(yǔ)result同樣是抽象名詞，故謂語(yǔ)動(dòng)詞也用單數(shù)，選B。
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