单项选择题

He was proud of being chosen to participate in the game and he ______ us that he would try as hard as possible.

A．insured
B．guaranteed
C．assumed
D．assured
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单项选择题
Many of those who come from the countryside find it difficult to adapt to the rapid ______ of modern life.
A．rate
B．pace
C．growth
D．speed
单项选择题
The president of the company ______ why the other members of the committee hadn't been informed of this important news.
A．required
B．acquired
C．inquired
D．requested
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