问题
选择题
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
答案
答案：D
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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
答案：D