单项选择题

Paul Samuelson revolutionized __________ by presenting his students with the most advanced economic thinking at an introductory level.

A．to teach economics
B．teaching that economics is
C．the teaching of economics
D．economics is taught
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单项选择题
__________ for the timely investment from the general public, our company would not be so thriving as it is.
A．Had it not been
B．Were it not
C．Be it not
D．Should it not be
单项选择题
An old woman was badly hurt in __________ the police describe as an apparently motiveless attack.
A．that
B．what
C．whatever
D．which
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