单项选择题

In the press conference before the final, the captain of the team gave his ______ that they would beat all their opponents.

A．assurance
B．assumption
C．sanction
D．insurance
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We must ______ the amount and quality of the products we make to the level of public demand.
A．harness
B．hatch
C．motivate
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Investment in new product development is an essential ______ of corporate success.
A．element
B．component
C．ingredient
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