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Though I was tired out that evening, I _____ from falling asleep by the great pain in my knee.
A.was prevented B.had preventedC.has prevented D.am prevented
A

试题分析:考查时态语态:句意:虽然我那天晚上很累,膝盖上的疼痛让我不能入睡。从Though I was tired out that evening,可知是一般过去式,而且I和prevent是被动关系,选A。
点评:英语中的时态主要由动词的形式决定,因此在学习英语时态时,要注意分析动词形式及具体语境,想象在那个特定的时间动作所发生的背景,这个动作是经常性动作、一般性动作、进行性动作、完成性动作还是将要发生的动作。。
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