单项选择题

The steam engine gives us an example of heat ______ into work.

A. turns
B. turned
C. turning
D. being turned
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单项选择题
______ such heavy loss, the businessman didn't have the courage to go on.
A. Having suffered
B. Suffering
C. To suffer
D. Suffered
单项选择题
The car burns more fuel, but ______ all things into consideration, it's still a good car.
A. taken
B. having taken
C. taking
D. to take
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