问题补充：
—You’ve won the drawing competition. Congratulations! Among all the pictures in the competition，I found was really amazing. By the way, when did you draw it?
—During the trip to the Sydney Opera House September.
A. yours; in
B. yours; on
C. you; in
D. you; on
答案：
(答案→)A. yours; in
B. yours; on
C. you; in
D. you; on
解析：此题重点考查名词性的物主代词，其可以单独使用，yours=your picture在几月份要用介词in.
