---CanIhelpyou,madam?  ---No,thankyou. I

問題詳情：

 ---Can I help you, madam?

   ---No, thank you.  I________ for my order.

       A. waited                                      B. had been waiting     

C. have waited                                      D. am waiting

【回答】

D

知識點：動詞時態與語態

題型：選擇題