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The construction of the two new railway lines   by now.
A．have been completedB．has been completedC．has coompletedD．have completed
b
B。考查動(dòng)詞時(shí)態(tài)和語(yǔ)態(tài)。由時(shí)間狀語(yǔ)by now直到目前為止可知應(yīng)該用現(xiàn)在完成時(shí)，鐵路線與建完之間是被動(dòng)關(guān)系所以要用被動(dòng)語(yǔ)態(tài)的現(xiàn)在完成時(shí)，句子的主語(yǔ)是抽象名詞短語(yǔ)，用單數(shù)謂語(yǔ)因此B是正確答案
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