问题补充：
Some people waste a lot of food others haven enough to eat.
A. once
B. when
C. as
D. while
答案：
A. once
B. when
C. as
(答案→)D. while
解析：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。
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