If a letter is addressed to Dr. Carla Brown, the salutation should read________. 
A、Dear Carla
B、Dear Sir or Madam
C、My dear Dr. Brown
D、Dear Dr. Brown
If a letter is addressed to Dr. Carla Brown, the salutation - Final Exam - 魔“方”作文——大学英文写作 - U校园 | 大学网课搜题引擎