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_________[A] by chance [B] in contrast [C] as usual [D] for instance
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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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_________(60)A.normal B.necessaryC.domestic D.for
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_________(63)A.by mistake B.by accidentC.in turn
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_________(52)A.to B.onC.in D.back
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.62._________A.among B.in C.as D.for