单项选择题

We'll all take a vacation in the mountains as soon as I finish working ______my project.

A．on
B．with
C．in
D．about
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单项选择题
The author of the book has shown his remarkably keen ______into human nature.
A．intellect
B．insight
C．perception
D．understanding
单项选择题
Steel is an alloy composed ______of iron and carbon.
A．primarily
B．traditionally
C．carefully
D．partially
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