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You shouldn’t keep silent when ____

A. speaking         B. spoken to        C. spoken           D. speaking to[來

You shouldn’t keep silent when _____.            
  A. speaking      B. spoken to      C. spoken      D. speaking to 

You shouldn’t keep silent when ____

A. speaking 　　 B. spoken to 　　　 C. spoken 　　　 D. speaking to

You shouldn’t keep silent when ____

A. speaking 　　 B. spoken to 　　 C. spoken 　　　 D. speaking to