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．a(chǎn)m prevented
A

試題分析：考查時態(tài)語態(tài)：句意：雖然我那天晚上很累，膝蓋上的疼痛讓我不能入睡。從Though I was tired out that evening,可知是一般過去式，而且I和prevent是被動關(guān)系，選A。
點評：英語中的時態(tài)主要由動詞的形式?jīng)Q定，因此在學習英語時態(tài)時，要注意分析動詞形式及具體語境，想象在那個特定的時間動作所發(fā)生的背景，這個動作是經(jīng)常性動作、一般性動作、進行性動作、完成性動作還是將要發(fā)生的動作。。
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