---John,whyareyousoupset?  ---I­­­      mycellphoneall...

問題詳情：

 ---John, why are you so upset?

   ---I­­­       my cell phone all morning but it is nowhere to be found.

   A. am looking for               B. have been looking for    

C. have looked for          D. had looked for

【回答】

B

知識點：動詞時態與語態

題型：選擇題