Every means ______ tried but without any result.
A．have beenB．is to beC．a(chǎn)re to beD．has been
D
此題考查時(shí)態(tài)和語(yǔ)態(tài)。句意：每種方法都試了，但是沒(méi)有結(jié)果。由句意可知要用現(xiàn)在完成時(shí)態(tài)，強(qiáng)調(diào)對(duì)現(xiàn)在造成的影響。
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