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
If you find this item too difficult to __________ ,it is advisable to leave as it is and move on to the next one.
A．work out
B．work on
C．work for
D．work at
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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