单项选择题

Variables such as individual and corporate behavior ______ nearly impossible for economists to forecast economic trends with precision.

A．make
B．make it
C．making
D．makes it
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单项选择题
We ______ but we forgot his telephone number.
A．might have called him
B．would call him
C．called him ______
D．should call him
单项选择题
The committee ______ already held ______ first meeting of the year.
A．have, its
B．has, its
C．has, their
D．have, their
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