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Every possible means _______ to prevent the crash , but the computer doesn’t still work．
A．is usedB．a(chǎn)re used
C．has been usedD．have been used
C
考察used用法。Be used to 習慣于某事：被用來做某事；used to do sth過去常常做某事。句意：每一種可能的方法都被用來預防崩潰，但是電腦仍舊不能運行�？芍枋龅氖乾F(xiàn)在已完成的動作，故用現(xiàn)在完成時態(tài)。主語means為不可數(shù)名詞，不可數(shù)故助動詞用has，選D。
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