31．The number of smokers has fallen 30% this year, with last year. A．by; comparing ——青夏教育精英家教网—

摘要：31．The number of smokers has fallen 30% this year, with last year. A．by; comparing B．at; compared C．by; compared D．at; comparing

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The number of smokers ________ fallen ________ 30% this year, compared with last year.

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The number of smokers ________ fallen ________ 30% this year, compared with last year.

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