The Egyptians ______ copper as early as 5,000 years before Christ.A、they were us

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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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