单项选择题

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

A．they were using
B．having used
C．may have used
D．using
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单项选择题
Just then we had an important piece of work in hand, the generator that supplies the power to the whole works broke ______ .
A．out
B．up
C．off
D．down
单项选择题
I hope you won't take ______ if I tell you the true.
A．annoyance
B．offence
C．resentment
D．irritation
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