你是劉玲(Liu Ling)，寫一封給曉東(Xiao Dong)的道歉信，講明道歉的原因、解決問題的辦法，以彌補因曉東來拜訪而自己不在家給他帶來的沮喪。

The man asking for a lift was．

• A、a robber who robbed drivers  
  

• B、a policeman who had worked in prison
  

• C、a Drisoner who had escaped from prison 
  

• D、a stranger with￡1，000 in his pocket

 That was so serious a matter that I had no choice but_____the police.

• A、called in
  

• B、calling in  
  

• C、call in  
  

• D、to call in