4．-John，how did your English exam go？
-I thought I _____，but in fact I came in the top 10% in the class．（　�。�
A．should have failedB．might have failed
C．couldn't have failedD．mustn't have failed

分析 ---約翰，你英語考試怎么樣？---我原以為可能會不及格，但事實(shí)上我是班級前10%．

解答 答案B．should have done表示對故去發(fā)生的事情的一種虛擬，意為"本來應(yīng)該做某事而實(shí)際未做"；might have done表示對過去發(fā)生的事情把握性較小的一種推測，意為"過去可能會做某事"；couldn't have done表示對過去發(fā)生的事情把握性極大的一種推測，意為"過去一定不可能做…"；mustn't不能用來表推測，也不表虛擬，沒有"mustn't have done"這種結(jié)構(gòu)．本題考查情態(tài)動詞表推測，故可排除A和D兩項(xiàng)；再根據(jù)下文的語境"but in fact I came in the top 10% in the class"和句子所表達(dá)的意思"我原以為可能會不及格"可知答案選B．

點(diǎn)評 本題考查情態(tài)動詞表推測的用法．"情態(tài)動詞+have done"可表示對發(fā)生過的事作某種猜測、推測．這個結(jié)構(gòu)是近幾年高考情態(tài)動詞的重點(diǎn)和難點(diǎn)．需要注意在肯定句或否定句中情態(tài)動詞表推測時強(qiáng)弱程度．在肯定句中：must＞should＞can＞could＞may＞might，在否定句中：can't＞couldn't＞may not，＞might not．

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