单项选择题

Although Ms. Brown found some of her duties to be ______, her supervision of forty workers was a considerable responsibility.

A．ambiguous
B．provisional
C．menial
D．unique
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单项选择题
Before 1500 North America was inhabited by more than 300 cultural groups, each with different customs, social structures, world views, and languages. Such diversity ______ the existence of a single Native American culture.
A．complements
B．implies
C．reiterates
D．argues against
单项选择题
The prime minister tried to act but her plans were ______ by her cabinet.
A．frustrated
B．discussed
C．embellished
D．overlooked
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