classroom is cleaner than A. Our; theirB. Our; theirsC. Their; ourD. Theirs; ours.

网友回答

A. Our; their
(答案→)B. Our; theirs
C. Their; our
D. Theirs; ours.
解析：此题重点考查形容词性的物主代词和名词性的物主代词的根本区别。名词性的物主代词就相当于形容词性的物主代词+名词。