12．She ___ have attended the meeting，for she was seeing a doctor then．（　�。�
A．shouldn'tB．mustn'tC．wouldn'tD．couldn't

分析 她不可能參加會(huì)議，因?yàn)槟菚r(shí)她在看醫(yī)生．

解答 答案D．
"shouldn't have done"用來(lái)表虛擬，意思是"本來(lái)不應(yīng)該做某事，但實(shí)際做了"；"mustn't不能用來(lái)表推測(cè)，也不表虛擬，沒(méi)有"mustn't have done"這種結(jié)構(gòu)；"wouldn't have done"用來(lái)表虛擬，意思是"過(guò)去將不會(huì)做…（實(shí)際上做了）"；couldn't have done用來(lái)表示對(duì)過(guò)去發(fā)生事情的推測(cè)，意思是"過(guò)去不可能做…"．根據(jù)句子所表達(dá)的意思"她不可能參加會(huì)議"可知，本題考查的是情態(tài)動(dòng)詞表推測(cè)，故答案選D．

點(diǎn)評(píng) 本題考察的是情態(tài)動(dòng)詞表示推測(cè)．情態(tài)動(dòng)詞表推測(cè)是高考的重要考察點(diǎn)之一，需要注意在肯定句或否定句中情態(tài)動(dòng)詞表推測(cè)時(shí)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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