The sentence is in the past tense indicating that the action of placing the price list has already happened Had put is the correct past perfect tense to indicate this Option A had l put is grammatical

因为这个句子是过去时态，说明放置价目表的动作已经发生过了。"Had put" 是正确的过去完成时态来表示这个意思。选项A "had l put" 是语法上不正确的。选项B "I have put" 是现在完成时态，不适用于句子中描述的过去动作。因此，选项C是正确答案。

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