—When is your birthday?—My birthday is September 5th.A. inB. atC. onD. for

问题补充：

—When is your birthday?

—My birthday is September 5th.

A. in

B. at

C. on

D. for

答案：

A. in

B. at

(答案→)C. on

D. for

解析：句意：--你的生日是什么时候？--我的生日是在9月5日。in +月份；at+时刻；on+某月某日；for+时间段。根据September 5th故选C。