题目内容
(2014贵州贵阳)In China and some other countries,it is impolite to speak loudly________you are having a meal.
A.before
B.while
C.after
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题目内容
(2014贵州贵阳)In China and some other countries,it is impolite to speak loudly________you are having a meal.
A.before
B.while
C.after