A-A+ The Egyptians ______ copper as early as 5 000 2022-08-01 21:55:57 问答库 阅读 167 次 问题详情 The Egyptians ______ copper as early as 5,000 years before Christ.A．they were usingB．having usedC．may have usedD．using请帮忙给出正确答案和分析，谢谢！ 参考答案 正确答案：C解析：mayhaveused表示对已发生事情较肯定地猜测。
