He is so young and short a man that I think he is but a professor of Northwest University.
A. anything
B. something
C. everything
D. nothing
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(答案→)A. anything
B. something
C. everything
D. nothing
解析：A 考察代词。句意：他如此年轻而且这么矮，我觉得他绝对不可能是西北大学的教授。由句意可知anything ,因为anything but表示绝不。