题目内容

The construction of the two new railway lines??? by now.

A.have been completed? B.has been completed? C.has coompleted?????? D.have completed

 

【答案】

b

【解析】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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