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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