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 -Ididn'tseeyouatthebeginningofthepartylastnight.  -I

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 -Ididn'tseeyouatthebeginningofthepartylastnight.  -I

 - I didn't see you at the beginning of the party last night.

   - I _____ on my biology report at that time.

      A. worked     B. work .       C. was working  D. am working

【回答】

C

知识点:动词时态

题型:选择题

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