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he bought a new car .改疑问句did he bought a new car?还是 did he b

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he bought a new car .改疑问句did he bought a new car?还是 did he buy a new car?
新概念第一册学完了.在第二册开头有个test.标准答案里是did he bought a new car?.问题是上面哪个对,Did后面难道不是动词原形吗?
did he buy a new car才是正确的