单项选择题

These tables showing the ups and downs of the world economy in the 1980's were compiled(汇编) ______ careful observation and detailed studies.

A．at the bottom of
B．in exchange for
C．in the name of
D．on the basis of
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单项选择题
Steamboats began to sail up and down the Mississippi River at the beginning of the 19th century, which contributed a lot the areas along the river.
A．to develop
B．to being developed
C．to be developed
D．to developing
单项选择题
I regretted ______the expensive air-conditioner.
A．not to afford
B．not affording
C．not being able to afford
D．I can't afford
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