问题
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_________[A] by chance [B] in contrast [C] as usual [D] for instance
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_________[A] if [B] unless [C] as [D] lest
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_________[A] So [B] Since [C] As [D] Thus
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_________(62)A.off B.onC.up D.for
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_________(54)A.at B.inC.on D.for
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_________(61)A.and B.besides C.as long as D.as go