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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:初中英语 来源:陕西省期末题 题型:单选题

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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