（届北京市海淀区高三下学期期中练习英语试卷）
You cannot take back your words ______ they are out of your mouth.
| A．before | B．whether | C．once | D．while |
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（届北京市海淀区高三下学期期中练习英语试卷）
You cannot take back your words ______ they are out of your mouth.
| A．before | B．whether | C．once | D．while |
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