20．This is         bedroom．It's big and clean．（　�。�
A．Lucy and Lily'sB．Lucy and Lily
C．Lucy's and LilyD．Lucy's and Lily's

分析 這是露西和莉莉的臥室．它很大并且很干凈．

解答 答案：A．考查名詞所有格．句意"這是露西和莉莉的臥室．它很大并且很干凈．"Lucy and Lily's 表示兩人共同所有的一個(gè)東西，則只能在后面那個(gè)名詞后面加上's，且后接單數(shù)名詞；Lily's and Lucy's表示兩人各自所有的兩個(gè)東西，則應(yīng)在兩個(gè)名詞后面都加上's，且后接復(fù)數(shù)名詞．根據(jù)題干This is ____bedroom．It's big and clean．可知bedroom為單數(shù)，應(yīng)為共同所有．故選A．

點(diǎn)評(píng) 掌握名詞所有格的用法，根據(jù)句意來具體分析判斷．

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