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 本句中的时间状语是for some time now，既表示过去到现在的一段时间，又包括现在阶段，所以应该选择现在完成进行时，表示动作从过去持续到现在并仍在进行。
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