Smoking, which may be _______ fun for some people, is _______ cause of discomfort for people around him.
A. /; a B. a; a C. a; / D. a; the
Smoking, which may be _______ fun for some people, is _______ cause of discomfort for people around him.
A. /; a B. a; a C. a; / D. a; the
解析：选A。考查冠词。句意为：吸烟对某些人来说也许很好玩，而实际上却使得周围的人感觉不舒服。fun是不可数名词，不与不定冠词a连用；吸烟是引起人们不舒服的因素之一，因此在cause前加不定冠词a。