单项选择题

We must cherish experience______at the cost of blood.

A．enquired
B．inquired
C．acquired
D．required
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单项选择题
Don't ______ to let me know if there is anything I can do for you.
A．reject
B．prevent
C．hesitate
D．refuse
单项选择题
There is ______ that well-educated citizens should devote their knowledge and skills to their own country and people.
A．no deny
B．no denying
C．not deny
D．not denied
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