【题目】My father ____ for Beijing on business tonight.
A. is about to leave B. has been leaving
C. is leaving D. would leave
在线课程【答案】C
【解析】句意：我父亲今晚去北京出差。be about to do sth．表示打算或安排即将发生的动作，它通常不与时间状语连用，be going to do sth．有三层含义：①表示打算、计划或决定要做某事。②用以表示某事物即将发生或很可能发生。③有迹象表明即将发生的动作或状态。句中有tonight，因此选择C.