____there is enough food in the world for everybody,not everyone can afford to buy it. ()____

问题描述:

____there is enough food in the world for everybody,not everyone can afford to buy it. ()____
A .While        B .As        C .Unless        D .When

选择While,意思是尽管世上有足够的食物给每个人,但是不是每个人都有能力买得起.