Some people ________ not have plans yet for New Year’s Eve, but others know exactly what they will be doing.

A．can

B．must

C．need

D．may

无锚点吊装技术其主要技术特征是取消了（）以及与之配套的（）。

A、缆风绳

B、大吨位地锚

C、滑车组

D、门架