题目内容：

Who is the man talking to the headmaster?” “ A
professor________ a visit to our school.”
A．pays
B．is paying
C．paid
D．paying
【精析与答案】 D.为什么呀

优质解答

这里从paying到最后是做后置定语修饰professor,实际上回答只有两个词“a professor”,把这两个词代到问句里,代替who的位置,懂了吗?