Sam is doing some _______ about the ancient Silk Road. A. exercise B. operations C. research D. expe...
2022-11-12 18:08:25 42次 2017届初中毕业升学考试（山东德州卷）英语 单项填空 反馈错误 加入收藏 正确率 : 100%
题目内容：
Sam is doing some _______ about the ancient Silk Road.
A. exercise B. operations C. research D. experiments
本题链接：
