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
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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
About ______ of the workers in that factory are young people.
A．third-fifths
B．three-fifths
C．three-fives
D．three-fifth
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