Lucy and Lily ______ sister.They study in the same school.(2

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Lucy and Lily ______ sister.They study in the same school.(2009北京市)
答案是are,为什么这里sister不加s?

因为原句中,Lucy and Lily are sister,应该被理解为她们的姐妹关系相对于对方而言的.
我这样说可能你就明白了：
Lucy is Lily's sister; lily is lucy's sister,
所以就不用加“S”了.

Lucy and Lily ______ sister.They study in the same school.(2 luce and lily ___ sister.they study at the same school 初一英语句型转换Lucy and Lily are in the same school.(改为同义句)Lucy and Lucy and Lily are in the same school.(改为同义句) Lucy and Lily are in the same school.改成同义句 1.lily and lucy are c______.they are in the same class. Lucy and Lily are s_and they look the same. Lily and Lucy are twins.They have the same l___ Lucy and Lily ______ in the same class A.am B.is C.are D.be They (b )study in the same middle school They don't study in the same school. Lucy and Lily look the same,but they are____ ____ ____ ____(