My summer camp isn't good fun, but it is real learning experience for me.
A. a; /
B. the; a
C. /; a
D. a; the
网友回答
A. a; /
B. the; a
(答案→)C. /; a
D. a; the
解析：C考察冠词，句义：我参加的夏令营一点都不好玩，但是对我来说是一次真正的学习的经历。Fun是不可数名词，表示泛指；experience在此是可数名词经历，表示泛指，所以使用不定冠词。故C正确。