22．Using renewable energy sources is a simple idea, but we find it hard to put into practic——青夏教育精英家教网—

摘要：22．Using renewable energy sources is a simple idea, but we find it hard to put into practice． A．one B．what C．which D．that

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Using renewable energy sources is a simple idea, but ______ we find it hard to put into

practice.

A. one B. what C. which D. that

Using renewable energy sources is a simple idea, but ________ we find it hard to put into practice．

A．one B．what C．which D．that

Using renewable energy sources is a simple idea, but ________ we find it hard to put into practice.

A．one B．what C．which D．that

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