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

题目内容

17、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

试题答案

17、A

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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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