问题: 请问一道英语选择题！
The construction of the two new railway lines ______ by now.
A. has completed
B. have completed
C. have been completed
D. has been completed
应该选哪个？如果去掉The construction of, 句子改成“The two new railway lines ______ by now.”，又应该选哪个呢？谢谢！
解答:
选D，因其主语是 “construction”， 如句子改成“The two new railway lines ______ by now.”，则选C.
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