• 1. (2020七上·渑池期末) 如图，已知∠AOB=120°，∠COD在∠AOB内部且∠COD = 60° ，则∠AOD与∠COB一定满足的关系为（ ）

  

  A . ∠AOD =∠COB B . ∠AOD + ∠COB = 180° C . ∠AOD = ∠COB D . ∠AOD + ∠COB = 120°