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9．The bell rang ______ the teacher was explaining the problem to the students..（　�。�
A．afterB．whileC．before

分析 當(dāng)老師在向同學(xué)們解釋難題的時候，鈴聲響了．

解答 答案：B；
根據(jù)設(shè)空處的句子用了過去進(jìn)行時，可以推斷本句的句意是"當(dāng)老師在向同學(xué)們解釋難題的時候，鈴聲響了．"，表示主句的動作發(fā)生在在從句動作持續(xù)進(jìn)行的過程中，所以用while引導(dǎo)該時間狀語從句，while"當(dāng)…時"，通常與延續(xù)性動詞連用，且用于進(jìn)行時中，故選B．

點評 本題主要考查連詞的用法，連詞在句子中主要起聯(lián)系上下文的作用，他們之間的區(qū)別就是表示邏輯關(guān)系的不同，所以在解題時先要理解上下文含義，然后根據(jù)上下文邏輯關(guān)系選擇合適的連詞．連詞的用法都比較多，語義之間還有交叉，熟記其基本應(yīng)用規(guī)則，了解其區(qū)別，注意固定搭配對象，是做好此類題型的關(guān)鍵．

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