单项选择题

Investment in new product development is an essential______ of corporate success.

A．element
B．component
C．ingredient
D．constituent
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单项选择题
Since colonial times, black people in South Africa have been______ by the white minority.
A．depressed
B．suppressed
C．oppressed
D．repressed
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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