单项选择题
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A.Doctor--patient.
B.Daughter-- mother.
C.Passenger--bus driver.
D.Customer--merchant.
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单项选择题
A.Classmates.B.Boss and secretary.C.Husband and wife.D.Teacher and student.
A.Classmates.
B.Boss and secretary.
C.Husband and wife.
D.Teacher and student.
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