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1.How can you possibly miss the news?It _______ on TV all da

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1.How can you possibly miss the news?It _______ on TV all day long.
A.has been B.had been C.was D.will be
2.The meeting ________ a full week by the time it ends.
A.will have lasted B.had lasted C.would last D.had lasted
这两道题我都知道答案,只是不知道原因,请大家给我讲一讲.
第一题A吧 因为广告已经开始放很久了 并且还有继续放下去的趋势 用现在完成时
第二题是我会选A 后面by the time it ends中end用一般现在时代替一般将来时,可知会议还没开呢 所以用将来时