国开《综合英语(2)》Unit 7 单元练习 形考试题 【题目】The students ______ at their desks when Mr. Black ______. waited, arrived were waiting, were arrived were waiting, arrived waited, were arrived 试题来源综合英语(2) 查看整套课程试卷 此内容查看价格为0.2金币，请先登录如有问题，请联系微信客服解决！
