what does Mary have in her box?还是What does Mary has in her box?

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what does Mary have in her box?还是What does Mary has in her box?
what does Mary have in her box?还是What does Mary has in her box?

what does Mary have in her box?还是What does Mary has in her box?
是这个:what does Mary have in her box?
前面已经用了does,后面用动词原形

what does Mary have in her box?这个说法对,因为这是个特殊问句,动词变为原型

what does Mary have in her box?

有助动词 does ,后面动词应该回为原形

What does Mary have in her box?

前者

是what does mary have in her box