单项选择题


A.at
B.to
C.on
D.from
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单项选择题
A.expectB.practiceC.exerciseD.appoint
A.expect
B.practice
C.exercise
D.appoint
单项选择题
A.professorsB.studentsC.politiciansD.businessmen
A.professors
B.students
C.politicians
D.businessmen
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