Do you know where _______ the price listwhich was faxed to us yesterdayAhad l putBl have putCl had put答案是什么又为什么选它呢

C. l had put

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 grammatically incorrect. Option B, "l have put," is in the present perfect tense, which is not appropriate for the past action described in the sentence. Therefore, option C is the correct answer.