He was about half through his meal ______ a familiar voice came to his ears.

A．whyB．whereC．whenD．while

C

解析試題分析：考查when引導的時間狀語從句，when可以表示“當…時候”，也可以表示 “這時”，相當于at that time，句意：他剛吃完一半的飯這時聽到一個熟悉的聲音。選C。
考點：考查when引導的時間狀語從句
點評：when引導時間狀語從句時表示“當……的時候”， when既可以指時間段也可指時間點， 從句中既可用延續(xù)性動詞又可用非延續(xù)性動詞， 且動作既可和主句的動作同時發(fā)生又可在主句的動作之前或之后發(fā)生，when也可以表示 “這時”，相當于at that time，適用于：be about to do… when…,be doing…when…,had done…when…。

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科目：高中英語 來源：福建省泉州一中2009-2010學年高二下學期期中考試英語試題 題型：閱讀理解


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When we donate blood, a small amount is usually taken in advance for at least ABO and Ph systems typing. If you are O+, the O is your ABO type and the + is your Rh type. It is possible to be A, B, AB, or O as well as Rh + or Rh-.

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       A．to put the blood into a container

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When we donate（捐獻）blood, a small amount is usually taken in advance for at least ABO and Rh systems typing. If you are O+, the O is your ABO type and the + is your Rh type. It is possible to be A, B, AB, or O as well as Rh + or Rh-.

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