_____they have lost the necklace in the palace may coule can might

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_____theyhavelostthenecklaceinthepalacemaycoulecanmight_____theyhavelostthenecklaceinthepalacemaycou

_____they have lost the necklace in the palace may coule can might
_____they have lost the necklace in the palace may coule can might

_____they have lost the necklace in the palace may coule can might
could

might
could have done表示本可以做而没做
might have done=may have done对过去事实的肯定猜测,语气较轻