单项选择题

Individual sports are nm by over 370 independent governing bodies whose functions usually include ______ rules, holding events, selecting national teams and promoting international links.

A．drawing on
B．drawing in
C．drawing up
D．drawing down
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单项选择题
The financial problem of this company is further ______ by the rise in interest rates.
A．increased
B．strengthened
C．reinforced
D．aggravated
单项选择题
The professor could hardly find sufficient grounds ______ his arguments in favor of the new theory.
A．to be based on
B．to base on
C．which to base on
D．on which to base
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