【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】

試題分析：句意：飯前洗手是一個(gè)好習(xí)慣。unless除非；while當(dāng)……的時(shí)候； when當(dāng)……的時(shí)候；before在……之前。結(jié)合生活常識(shí)可知該選D。

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