--- Jack , could you tell me ?
----Sure . In the post office on Green Road ,
A. where you bought the stamps
B. where did you buy the stamps
C. when you bought the stamps
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解析：此题重点考查宾语从句的时态和语序问题，无论哪种句式结构充当宾语从句都要用陈述句语序，从句的时态要和主句的时态保持一致。因主句的谓语动词是过去式从句的谓语动词也要用相应的过去时态。