单项选择题
A.If
B.Although
C.Because
D.Before
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单项选择题
A.student'sB.professor'sC.assistant'sD.librarian's
A.student's
B.professor's
C.assistant's
D.librarian's
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单项选择题
A.orB.andC.toD.but
A.or
B.and
C.to
D.but
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