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
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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
__________ 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
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