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D
解析 本句为一般性陈述，没必要用过去时态，排除A、C；B中have to表示不得不做某事，而will表示主观愿意去做某事，两者语义矛盾；D中have been表示从过去一直持续到现在，且will be表示从现在开始将继续持续到将来，两者在时态上连贯，符合题意。D为答案。
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