单项选择题
There was an accident _______ the crossroads at midnight last night.
A．in
B．on
C．at
D．by
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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
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