You cannot take back your words _________ they are out of your mouth.
A．beforeB．whetherC．onceD．while
C               
             
試題分析：考查連詞辨析。句意：一旦話已出口，你不能收回你說的話。Take back 收回。they are out of your mouth是主句的假設(shè)條件，故選C項(xiàng)。  
考點(diǎn) : 考查連詞辨析
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