单项选择题
Directions: For each numbered blank in the following passage there are four choices labeled [A], [B], [C], and [D]. Choose the most suitable one.
...the US is increasingly becoming a nation of part timers and temporary workers.This disposable work force is the most important trend in American business today, and it is changing the relationship between people and their jobs.
A.instantly
B.reversely
C.fundamentally
D.sufficiently