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如果你要把fruit 运用到be中
你可以询问他人最喜欢的水果是什么
what are(be 的复数形式are) your favourite fruit?
my favourite fruit is apple.
询问他人的朋友最喜爱的水果是什么
what is (be 的单数形式is)your mother's favourite fruit?
her favourite fruit is pineapple.
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