9．Chinese President Hu Jintao called for an immediate cease-fire in Libya _____ an even worse humanitarian crisis in the country at the BRICS Summit in Hainan Province．（　�。�
A．to preventB．to have prevented
C．preventingD．having prevented

分析 在海南省舉行的金磚國家峰會上，中國主席胡錦濤呼吁利比亞立刻�；鹨员苊庠谶@個的國家更糟糕的人道主義危機(jī)．

解答 答案是A．本題考查動詞不定式的用法．根據(jù)上下文的邏輯，�；鸬哪康氖�"為了阻止"更糟糕的人道主義危機(jī)，只有動詞不定式可以表示目的，所以排除C和D；B項(xiàng)是動詞不定式的完成式，表示不定式的動作在謂語動詞之前，很顯然"prevent"的動作不在"call for"之前，所以排除B，答案選擇A．

點(diǎn)評 非謂語動詞的選擇，首先要根據(jù)句子的結(jié)構(gòu)判斷句中缺少的是謂語動詞還是非謂語動詞；如果是非謂語動詞，在理解非謂語動詞的基本用法的基礎(chǔ)上再根據(jù)句子的結(jié)構(gòu)做出判斷．

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