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【题目】Look at your dirty hands. You should go and wash your hands ________ you have lunch.

A. after B. before

C. while D. although

【答案】B

【解析】

句意:看你那双脏手。在你吃午饭之前,你应该去洗手。A. after在……之后;B. before在……之前;C. while当……的时候;D. although尽管,虽然。根据上文Look at your dirty hands.可知,是在吃午饭之前。根据题意,故选B。

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