15．When he saw all his books _____ here and there on the floor，he knew that something terrible _____．（　�。�
A．lying； must have happenedB．lie； must happen
C．lay； might have happenedD．had lain； could have happen

分析 當(dāng)他看見(jiàn)書(shū)在地板上到處都是的時(shí)候，他知道肯定是發(fā)生了什么糟糕的事．

解答 答案是A．本題考查感官動(dòng)詞和情態(tài)動(dòng)詞．see后常常接不帶to的動(dòng)詞不定式或動(dòng)名詞做賓語(yǔ)補(bǔ)足語(yǔ)，即see sb．/sth．do/doing，由此排除C和D；對(duì)已經(jīng)發(fā)生的動(dòng)作或狀態(tài)的推測(cè)用"情態(tài)動(dòng)詞+have done"的結(jié)構(gòu)；由句中的動(dòng)詞saw和knew判斷事件已經(jīng)發(fā)生，所以選用must have happened表示"肯定已經(jīng)發(fā)生"，故答案選擇A．

點(diǎn)評(píng) 要在正確理解情態(tài)動(dòng)詞的基本含義的基礎(chǔ)上，整體理解語(yǔ)境中的情感態(tài)度，做出合理的判斷．

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