问题
选择题
—Who is the man ______ by a group of students there?
—A professor _____ research on physics.
A．followed; did
B．following; did
C．followed; doing
D．following; doing
答案
答案：C
题目分析：句意为：----后面跟着一群学生的那位男士是谁？ ----做物理研究的一位教授。the man 与follow之间的关系为被动作后置定语，应为followed, a professor与do 之间的关系为主动，教授做研究。故应为C