单项选择题

You and I could hardly understand, ________

A．could we
B．couldn’t you
C．couldn’t we
D．could I
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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
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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