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