When I got to classroom late, the class had already started and the teacher ___

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问题 When I got to classroom late, the class had already started and the teacher ______ (write) maths problems on the blackboard.

选项

答案 had been writing

解析本题考查动词的用法。write动作发生在get动作之前，应用过去完成时；强调正在进行，用进行时，该句意为：当我迟到到达教室时；老师已经开始上课，并在黑板上写数学题了。

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