What can we infer from the passage?A.Over the last two decades, colleges altered the compo
What can we infer from the passage?
A.Over the last two decades, colleges altered the composition of their work force.
B.In the past twenty years, the number of full-time instructors increased by 630,000.
C.All the managerial positions added during the period from 1987 to 2007 were full time.
D.There were altogether 614,000 teaching positions in the United States in 2007.