Every possible means _______ to prevent the crash , but the computer doesn’t sti
题型:不详难度:来源:
Every possible means _______ to prevent the crash , but the computer doesn’t still work.A.is used | B.are used | C.has been used | D.have been used |
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答案
C |
解析
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。 |
举一反三
______ students up to 2, 000 , the school has built another laboratory. |
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