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

They called () the match because of rain.

A. out
B. off
C. back
D. upon

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

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