"He left______you turned back to write on the blackboard.""> "He left______you turned back to write on the blackboard."">
"When did John leave the classroom?"
"He left______you turned back to write on the blackboard."
"When did John leave the classroom?"
"He left______you turned back to write on the blackboard."
A、until
B、before
C、the time
D、the moment
【正确答案】：D
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