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A.in return B.in turnC.by hand D.in silence
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【C3】A.in returnB.in turnC.by handD.in silence
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【C9】A.in a wordB.by the wayC.in other wordsD.in addition
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【C10】A.by contrastB.for instanceC.in additionD.however
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【C18】A.By contrastB.In a wordC.In generalD.By the way
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In the opening paragraph, the author introduces his topic by______.A.posing a contrastB.ju
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【C6】A.In additionB.By comparisonC.In conclusionD.By chance