John always tries to _____ people who are useful to him professionally.
A. develop B. provoke C. correspond  D. cultivate
[答案]D. cultivate.
[注释]cultivate sb.结识（有地位的人），培养与......的友谊：He always tries to cultivate rich and famous people.(他总是极力结识有钱的知名人士。)
本题译文：约翰总是力图结识在职业方面对他有用的人。