【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:飯前洗手是個好習(xí)慣。unless除非;while當(dāng)……的時候; when當(dāng)……的時候;before在……之前。結(jié)合生活常識可知該選D。

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