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

分析 她不可能參加會議，因為那時她在看醫(yī)生．

解答 答案D．
"shouldn't have done"用來表虛擬，意思是"本來不應該做某事，但實際做了"；"mustn't不能用來表推測，也不表虛擬，沒有"mustn't have done"這種結構；"wouldn't have done"用來表虛擬，意思是"過去將不會做…（實際上做了）"；couldn't have done用來表示對過去發(fā)生事情的推測，意思是"過去不可能做…"．根據句子所表達的意思"她不可能參加會議"可知，本題考查的是情態(tài)動詞表推測，故答案選D．

點評 本題考察的是情態(tài)動詞表示推測．情態(tài)動詞表推測是高考的重要考察點之一，需要注意在肯定句或否定句中情態(tài)動詞表推測時強弱程度．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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