9．He raised his voice，______ we still couldn't hear anything．（　�。�
A．soB．orC．butD．as

分析 雖然他提高了嗓音，但是我們還是什么都聽不見．

解答 答案：C
A．so表示因果關(guān)系"因此"； B．or 表示選擇"或者"；或表示轉(zhuǎn)折"否則"； C．but表示轉(zhuǎn)折"但是"；  D．a(chǎn)s用作連詞，可引導(dǎo)比較、時間、原因及方式等四種狀語從句；分析句意可知，此處的前后兩句之間為轉(zhuǎn)折關(guān)系，意為"但是"；故選C．

點評 本題考查了轉(zhuǎn)折連詞but用法；做類似的題時，需要掌握各連詞所表示的意義及用法．

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