---Could you please tell me _____?---Sure , there is a post office at the end of the road .A.how can I buy some stampsB.where I can buy some stampsC.where I could buy some stampsD.how could I buy some stamps
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B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。Could在此处表示语气而不是时态。