2. 外语
  3. I was______playing the piano yesterday, but I was too busy.

I was______playing the piano yesterday, but I was too busy.

admin2013-01-10  50
问题 I was______playing the piano yesterday, but I was too busy.
选项 A、to be starting
B、to start
C、to have started
D、to have been starting
答案C
解析
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