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Some people waste a lot of food ____ others haven't enough to eat.
A.onceB.whenC.asD.while
D

试题分析:考查连词:A. once一旦B. when当…时候,C. as当…时候,正如,因为,D. while当…时候,虽然,然而,句意:一些人浪费粮食而有些人吃不饱。选D。
点评:连词的词义辨析要放在上下文的语境中进行,要注意上下文的语义的串联以及逻辑关系的推理,特别要注意一些连词和时间状语的固定搭配。
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