中国大学MOOC: When was the HZMB opened to the public?

When was the HZMB opened to the public? A: 23 October 2018 B: 24 October 2018 C: 25 October 2018 D: 26 October 2018

—The 55 kilometer HZMB（港珠澳大桥）opened to the public on Oct. 24th. 2018. —It is ________ cross-sea bridge in the world, linking Hong Kong, Zhuhai and Macao. A: long B: longe C: longest D: the longest