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试题详情及答案解析
             mother went to their room and clean it.
A.Lucy and LilyB.Lucy’s and Lily’s
C.Lucy and Lily’sD.Lucy’s and Lily
答案:C
试题分析:句意:Lucy和 Lily的妈妈去她们的房间打扫它。mother是名词单数,指一个人。A. Lucy and LilyLucy和 Lily, B. Lucy’s and Lily’s  Lucy的和 Lily的, C. Lucy and Lily’s  Lucy和 Lily的(两者共有)。据句意,故选C。
考点:考查名词所有格。