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
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B解析试题分析：本题为语法题，考查对时态的掌握。详细解答：由句中时间状语“for some time now”可知，这里要用现在完成时；选项B为现在完成进行时，表示动作从过去某一时间一直持续到现在，故为正确