单项选择题

Mobility is one of the characteristics often（）executives, and they must accustom themselves to moving quite regularly.

A. demanded of
B. asked for
C. expected from
D. called for

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单项选择题
Everything in the universe undergoes（）development and change.

A. continuous
B. continual
C. continued
D. constant
单项选择题
He said it was impossible for（）a mistake in a computer's calculation, so you can rely on that.

A. there being
B. there would be
C. there to be
D. there was
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