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

问题详情：

 ---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

知识点：动词时态与语态

题型：选择题