下列事件中，必然发生的事件是 [      ]

A．明天会下雨

B．小明数学考试得99分

C．今天是星期一，明天就是星期二

D．明年有370天

  Soon they got to a point where two roads met; they didn’t know _________.

A．which road to go

B．what road to go

C．which road to take

D．what road to take