When I came into the classroom, I saw Jack _____ something on the the blackboard. 

A. is writing
B. was writing
C. to write
D. writing
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科目：初中英語 來源：陜西省期末題 題型：單選題

When I came into the classroom, I saw Jack _____ something on the the blackboard. 
[     ]
A. is writing
B. was writing
C. to write
D. writing

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