2,Tom is____brother.A,Lucy and Lily's B,Lucy's and Lily C,Lucy's and Lily's D,Lucy and Lily.请解释

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2,Tomis____brother.A,LucyandLily''sB,Lucy''sandLilyC,Lucy''sandLily''sD,LucyandLily.请解释2,Tomis____brothe

2,Tom is____brother.A,Lucy and Lily's B,Lucy's and Lily C,Lucy's and Lily's D,Lucy and Lily.请解释
2,Tom is____brother.A,Lucy and Lily's B,Lucy's and Lily C,Lucy's and Lily's D,Lucy and Lily.请解释

2,Tom is____brother.A,Lucy and Lily's B,Lucy's and Lily C,Lucy's and Lily's D,Lucy and Lily.请解释
选a 后一个人名加`s 前一个不加