问题
选择题
It takes years of _____ practice to gain the skill of ______ expert. [ ]
A. a ; the
B. / ; a
C. a ; an
D. / ; an
答案
答案：D
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It takes years of _____ practice to gain the skill of ______ expert. [ ]
A. a ; the
B. / ; a
C. a ; an
D. / ; an
答案：D
