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【题目】It’s a good habit to wash your hands ________ you have meals.

A. unless B. while

C. when D. before

【答案】D

【解析】

试题分析:句意:饭前洗手是个好习惯。unless除非;while当……的时候; when当……的时候;before在……之前。结合生活常识可知该选D。

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