单项选择题

As the chairman of the students' union, Thomas was said __________ other students in need.

A．to help
B．to be helping
C．to have helped
D．to have been helped
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单项选择题
Every one of us considers the combination of theory with practice as _________ vital importance.
A．for
B．of
C．to
D．with
单项选择题
Johnson cannot but __________ his tutor for supervising him to solve the difficulty he has in doing his project.
A．to turn to
B．turn to
C．turning to
D．turned to
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