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    精英家教网 > 高中英语 > 题目详情
    The construction of the two new railway lines   by now.
    A．have been completedB．has been completedC．has coompletedD．have completed
    b
    B。考查动词时态和语态。由时间状语by now直到目前为止可知应该用现在完成时，铁路线与建完之间是被动关系所以要用被动语态的现在完成时，句子的主语是抽象名词短语，用单数谓语因此B是正确答案
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