单选题 The policeman asked the witness (证人) to ＿＿＿＿＿＿＿＿＿＿ to mind exactly what happened. 的答案

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题目内容：
The policeman asked the witness (证人) to ＿＿＿＿＿＿＿＿＿＿ to mind exactly what happened.
题目选项

remember