In America many people waste a lot of food in Africa people haven’t enough to eat. A. ho

问题补充：

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

答案：

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。