12．---When did Peter come？
---________ I was talking on the phone，he came in．（　�。�
A．AfterB．WhileC．UntilD．Before

分析 --Peter什么時(shí)候來的？
--當(dāng)我在打電話的時(shí)候，他進(jìn)來了．

解答 答案：B；
根據(jù)設(shè)空處的句子用了過去進(jìn)行時(shí)，可以推斷本句的句意是"當(dāng)我在打電話的時(shí)候，他進(jìn)來了．"，表示主句的動(dòng)作發(fā)生在在從句動(dòng)作持續(xù)進(jìn)行的過程中，所以用while引導(dǎo)該時(shí)間狀語從句，while"當(dāng)…時(shí)"，通常與延續(xù)性動(dòng)詞連用，且用于進(jìn)行時(shí)中，故選B．

點(diǎn)評(píng) 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(shí)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(duì)象，是做好此類題型的關(guān)鍵．

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