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The letters for the boss_ on his desk but he didn’t read the

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The letters for the boss_ on his desk but he didn’t read them until three later.A.were put
B has put 为什么不用has put
不好意思 是three day later 少打了~
The letters for the boss_ on his desk but he didn’t read the
put 和letter是动宾关系,所以要用被动语态.并且letters 是主语,不能用第三人称单数has的形式
如果用完成时,那也要用have been put,而不是has put