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

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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