题目内容

You cannot take back your words _________ they are out of your mouth.
A．beforeB．whetherC．onceD．while
C               
             
试题分析：考查连词辨析。句意：一旦话已出口，你不能收回你说的话。Take back 收回。they are out of your mouth是主句的假设条件，故选C项。  
考点 : 考查连词辨析
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