I am sorry that I can not meet you at the airport. I          Changsha by the time you come back from abroad.

A．am leaving

B．will leave

C．will have left

D．have left

根据法律效力范围的不同，法律可分为( )。

A．国际法和国内法

B．一般法和特别法

C．根本法和普通法

D．公法和私法