对建设单位聘请的物业服务企业或者其他管理人，（）有权依法更换。
A.物业管理企业
B.业主
C.居民委员会
D.业主委员会
参考答案：B
—Mary, could you tell me if your mother ________ our school sports meeting tomorrow?
—I think she will come to school if she ________ free. [ ]
A. will take part in; will be
B. takes part in; is
C. will take part in; is
D. takes part in; will be
社会分层的涵义、方法
