单项选择题
A.studied
B.researched
C.surveyed
D.observed
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单项选择题
A.focusesB.basesC.dependsD.takes
A.focuses
B.bases
C.depends
D.takes
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单项选择题
A.exactB.definiteC.certainD.decisive
A.exact
B.definite
C.certain
D.decisive
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