Peter’s friends laughed at him, because he got bad grade in the exam.Peter was

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问题 Peter’s friends laughed at him, because he got bad grade in the exam.
Peter was ______ his friends because he got bad grade in the exam. [br]

选项

答案 Had worked hard/had been working hard

解析改写的句子中有since that time，说明前面的谓语动词应该使用完成时，而整个句子使用的是过去时，因此，可以考虑使用过去完成时或过去完成进行时。

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