—Who is the man ______ by a group of students there?
—A professor _____ research on physics.
A．followed; didB．following; did
C．followed; doingD．following; doing
C

試題分析：句意為：----后面跟著一群學(xué)生的那位男士是誰？ ----做物理研究的一位教授。the man 與follow之間的關(guān)系為被動作后置定語，應(yīng)為followed, a professor與do 之間的關(guān)系為主動，教授做研究。故應(yīng)為C
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