选择 ：( ) Betty's favorite food is cakes.A：Where's B：How is C：

C,对物品提问,用what
再问： 可是。C的选择 为什么还有一个's 。。所以我不懂这道题。
再答： what's=what is 题目： what is betty's favorite food？ 可以放到后面 betty's favorite food is what？