--Icalledyoulastnight,butyoudidn’tanswer.  --Sorry,Grac...

问题详情：

-- I called you last night , but you didn’t answer.

  -- Sorry, Grace. I________I am A Singer when the phone rang.

  A. am watching         B. was watching       C. have watched

【回答】

B

知识点：动词时态

题型：选择题