问题

154Using renewable energy is a simple idea, but ______ we find it hard to put into practice

A:one
B:what
C:which
D:That

正确答案是：

同类题型

Who is the man ______ is readinga book over there?

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Why don’t you bring ____ to his attention that you are too busy to do it

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ssor Smith, can I meet you at 10 o’clocktomorrow morning—Oh, I’m sorry. I alecture at Hunan Normal University.