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．to make it
C．it makes
D．make it
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单项选择题
The weather has changed suddenly; ______ we must add more clothes.
A．eventually
B．subsequently
C．accordingly
D．in accordance
单项选择题
The villagers were very ______ for what those soldiers had done for them.
A．grateful
B．regretful
C．gradual
D．graceful
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