In America, many people waste a lot of food in Africa people haven’t enough to eat.
A. however
B. although
C. as
D. while
网友回答
A. however
B. although
C. as
(答案→)D. while
解析：考查连词。However 然而，although 虽然，as 因为，while 当什么时候，然而（表示对比）句意：在美国许多人浪费了很多食物，然而在非洲人们没有足够的吃的。故选D。