时态 有问题
主语从句的谓语用的是 现在时
主句谓语 was 应改为 has been
表语从句 中的谓语 应改为 are
在过去的25年里 并不是表示过去的时间状语
而是从现在 往前推 25年 所以和现在有关系 不能用过去时 应该用现在完成时
During the past quarter-century,what the plenty of parallel
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