?选择题:Sales of wine have fallen _ 30% in the last ten years . A、on

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?选择题:Sales of wine have fallen _ 30% in the last ten years . A、on
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?选择题:Sales of wine have fallen _ 30% in the last ten years . A、on
?选择题:Sales of wine have fallen _ 30% in the last ten years . A、on

?选择题:Sales of wine have fallen _ 30% in the last ten years . A、on
by

选择off

fall to 下降到
fall by 下降了
根据语意 用by 在过去的十年中,酒的销量已经下降了30%

by

down .faii down 掉落,掉下的意思

fall to 下降到
fall by 下降了

BY