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 动词时态题。句中的时间状语for some time now既表示现在阶段又表示一段时间．因此谓语动词应使用现在完成进行时．故[B]have been pointing符合题意。[A]had been pointing用过去完成进行时表示过去某一刻以前曾持续发生过的事情；[C]were pointing强调过去某时刻或某阶段正在进行的动作；[D]pointed指过去某时间的动作或状态，均可以排除。
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