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
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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
单项选择题
They were all to blame; why __________ him __________ for punishment
A．carry; out
B．pick; out
C．single; out
D．work; out
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