单项选择题

Walter offered us a lift when he was leaving the office, but our work ______, we refused the offer.

A．not finishing
B．had not been finished
C．not having finished
D．not being finished
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单项选择题
______ to his research work, the professor cared little about any other things.
A．Devoting
B．Devoted
C．Having devoted
D．To devote
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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