单项选择题
A.over
B.and
C.or
D.on
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单项选择题
A.focusesB.concentratesC.centersD.emphasize
A.focuses
B.concentrates
C.centers
D.emphasize
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单项选择题
A.inB.atC.withD.on
A.in
B.at
C.with
D.on
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