For some time now world leaders out the necessity for agreement on climate change the w

问题补充：

For some time now, world leaders out the necessity for agreement on climate change, the world economy and African development．

A. had been pointing

B. have been pointing

C. were pointing

D. pointed

答案：

A. had been pointing

(答案→)B. have been pointing

C. were pointing

D. pointed

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