Question

—Where does he come from?
—I know nothing about him except that he is a doctor      occupation.

A．in

B．by

C．through

D．for

Answer 1

B

试题分析：考查介词：by occupation职业的，句意：他从哪里来？--我对他一无所知，除了他是个医生。选B。
点评：介词的考查主要看搭配，同样的名词可以搭配不同介词，含义也不一样，做题时结合句意来做出判断。