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
A television programme ______ Kim'll fix it invites viewers to say what they really want to do.
A．being called
B．having called
C．calling
D．called
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