单项选择题
A.effective
B.passive
C.relative
D.expressive
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单项选择题
A.teachersB.classmatesC.partnersD.students
A.teachers
B.classmates
C.partners
D.students
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单项选择题
A.to requireB.requiredC.requiringD.are required
A.to require
B.required
C.requiring
D.are required
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