When he saw all his books here and there on the floor.he knew that something terrible ．( )A．lying, must have happenedB．lie, must happenC．lay, might have happenedD．had lain, could have happen 题目和参考答案——青夏教育精英家教网—

15．When he saw all his books _____ here and there on the floor，he knew that something terrible _____．（　　）

	A．	lying； must have happened		B．	lie； must happen
	C．	lay； might have happened		D．	had lain； could have happen

分析当他看见书在地板上到处都是的时候，他知道肯定是发生了什么糟糕的事．

解答答案是A．本题考查感官动词和情态动词．see后常常接不带to的动词不定式或动名词做宾语补足语，即see sb．/sth．do/doing，由此排除C和D；对已经发生的动作或状态的推测用"情态动词+have done"的结构；由句中的动词saw和knew判断事件已经发生，所以选用must have happened表示"肯定已经发生"，故答案选择A．

点评要在正确理解情态动词的基本含义的基础上，整体理解语境中的情感态度，做出合理的判断．

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