单项选择题

--Tim, what are you looking at ?
   ---Sorry , Mr. Smith. I ___ out at a bird outside the window.
   A.looked   B.am looking   C.have been looking   D.was looking

A.  
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单项选择题
---Do you work hard at your lessons? ---Yes, I no efforts. A.spend B.spare C.waste D.share
单项选择题
－－－What's the matter with Jane? She has been sitti
A.   
B.
  
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