The rapid-transit rail lines should . The management system of the rapid transit rail lines .

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问题 The rapid-transit rail lines should ______.
The management system of the rapid transit rail lines ______.

选项 A、is already quite developed
B、does not exist at all
C、is not good enough
D、needs to include the strict guidelines

答案C

解析本题需要进行推断，依据是第二段首句，关键部分是management systems of such lines should be improved，意思是"管理系统需要改进"，即还不够完善。

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GCT工程硕士（英语）

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