单项选择题
A.studied
B.researched
C.surveyed
D.observed
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单项选择题
A.amongB.betweenC.inD.to
A.among
B.between
C.in
D.to
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单项选择题
A.itB.peopleC.themD.things
A.it
B.people
C.them
D.things
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