What else may she______to buy for making a cake?A.need B.needs C.has D.does请说明理由

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What else may she______to buy for making a cake?A.need B.needs C.has D.does
请说明理由

Answer A.
A是动词原形;而B,C,D都是第三人称单数形式.此处有may这一情态动词位于实意动词之前,用动词原形.
→肯定句:She may need to buy ... for making a cake.