When the teacher came in, Jim was drawing a horse on the blackboard.

老师进来的时候，吉姆正在黑板上画一匹马。

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I was drawing a car on the blackboard when the teacher came into the classroom.

我正在黑板上画一辆小汽车，那时老师走进教室。

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I was drawing a car on the blackboard when the teacher came into the classroom.

我正在黑板上画一辆小汽车，那时老师走进教室。

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