【題目】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：吃飯之前洗手是個(gè)好習(xí)慣。根據(jù)設(shè)空處前面的wash your hands可以推測(cè)整個(gè)句子的意思是"吃飯之前洗手是個(gè)好習(xí)慣．"表示"在…以前"用before; 故選D。

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