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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】句意:吃饭之前洗手是个好习惯。根据设空处前面的wash your hands可以推测整个句子的意思是"吃饭之前洗手是个好习惯."表示"在…以前"用before; 故选D。

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