Some people waste food other people haven’t got enough to eat.A. whenB. untilC. sinceD. wh

问题补充：

Some people waste food，other people haven’t got enough to eat.

A. when

B. until

C. since

D. while

答案：

A. when

B. until

C. since

(答案→)D. while

解析：本题考查连词。when 当什么时候，until 直到，since 自从，while “而，但”，表示前后意义的转折对比，句意：一些人浪费食物，然而一些人没有足够的食物吃。所以选D。