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

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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 由时间状语For some time now可知,句中的动作发生在过去,一直延续到现在,而且还将持续下去,故用现在完成进行时,故选B。
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