选b
a,c可以直接排除,因为这是主系表结构,句子里的其他动词都要变成非谓语动词
d 是进行时态,意思是它正在扔食物给动物么?
b是对的 因为it是to throw的形式主语,这个句型是it is + adj.+ to do
Is it right ___ food to the animals in the zoo?
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