Liu Ming is 18-year-old student. He got a gold medal in the competition. A. a B. an C. the

问题补充：

Liu Ming is 18-year-old student. He got a gold medal in the competition.

A. a B. an C. the

答案：

解析：eighteen这个单词的音标的第一个因素是元音因素/e?/，要用冠词an.整句理解：Liu Ming是个18岁的学生，在比赛中得了一块金牌。所以选B.