So far we have done a lot to build a low-carbon economy but it is ideal. We have to work

问题补充：

So far we have done a lot to build a low-carbon economy, but it is ideal. We have to work still harder.

A. next to

B. far from

C. out of

D. due to

答案：

A. next to

(答案→)B. far from

C. out of

D. due to

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