单选题
13.
For some time now, world leaders______out the necessity for agreement on arms reduction.
A、
had been pointing
B、
have been pointing
C、
were pointing
D、
pointed
【正确答案】
B
【答案解析】
根据时间状语“for some time now”，句子要用现在完成进行时态。因此，答案为B。
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