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
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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
单项选择题
I can hardly imagine the great trouble they will have to take ______ their war-struck country.
A．rebuilding
B．rebuild
C．to rebuild
D．rebuilt
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