Sam is doing some ________ about the ancient Silk Road. A.research B.operations C.exercise D.experim...
2022-09-16 03:40:29 27次 2019年天津市西青区中考二模英语试卷 单选题 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.research B.operations C.exercise D.experiments
本题链接：
