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_____they have lost the necklace in the palace may coule can

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_____they have lost the necklace in the palace may coule can might
_____they have lost the necklace in the palace may coule can
could
再问: 为什么呀
再答: 因为是可能性,他们在猜项链是不是丢在皇宫里面了,而且丢失是过去式,所以是could 。