Every possible means _______ to prevent the crash , but the computer doesn’t still work.A.is usedB.a

题目简介

Every possible means _______ to prevent the crash , but the computer doesn’t still work.A.is usedB.a

题目详情

Every possible means _______ to prevent the crash , but the computer doesn’t still work.
A.is usedB.are used
C.has been usedD.have been used
题型:单选题难度:偏易来源:不详

答案

C
考察used用法。Be used to 习惯于某事:被用来做某事;used to do sth过去常常做某事。句意:每一种可能的方法都被用来预防崩溃,但是电脑仍旧不能运行。可知描述的是现在已完成的动作,故用现在完成时态。主语means为不可数名词,不可数故助动词用has,选D。

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