单项选择题
A.studied
B.surveyed
C.researched
D.observed
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单项选择题
A.amongB.inC.betweenD.to
A.among
B.in
C.between
D.to
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单项选择题
A.wayB.methodC.meansD.approach
A.way
B.method
C.means
D.approach
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