2. 外语
  3. The Egyptians ______ copper as early as 5,000 years before Christ.

The Egyptians ______ copper as early as 5,000 years before Christ.

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问题 The Egyptians ______ copper as early as 5,000 years before Christ.
选项 A、they were using
B、having used
C、may have used
D、using
答案C
解析 may have used表示对已发生事情较肯定地猜测。
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