单项选择题
A.concerned with
B.concerning
C.concerning with
D.concerned for
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单项选择题
A.ratifyB.testifyC.certifyD.gratify
A.ratify
B.testify
C.certify
D.gratify
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单项选择题
A.reactionB.actionC.interactionD.relation
A.reaction
B.action
C.interaction
D.relation
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