题目

Recently, professor of philosophy (哲学)in the United States has written a book called Money and the Meaning of Life. He has discovered that how we deal with money in our daily life has more meaning than we usually think. One of the exercises he asked his students to do is to keep a record of every penny they spend for a week. From the way they spend their money, they can see what they really value in life. He says our relations with others often become dearly defined (清晰的）when money enters the picture. You might have wonderful relationship with somebody and you think that youRemember to keep in touch with your teachers and classmates ________ graduation.A.whenB.beforeC.duringD.after