For some time now, world leaders _____ out the necessity for agreement on arms r

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问题 For some time now, world leaders _____ out the necessity for agreement on arms reduction.

选项 A、had been pointing
B、have been pointing
C、were pointing
D、pointed

答案 B

解析语法规则。由于出现了for some time now这一既表示现阶段又表示一段时间的状语，故应使用现在完成进行体。

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