单项选择题

The price of this machine is not reasonable.

A. helpful
B. kind
C. fair
D. effective
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单项选择题
I think they are quite confident in their conclusion.
A. certain
B. worried
C. suspicious
D. doubtful
单项选择题
She finally abandoned her original method and took a new approach.
A. supported
B. promoted
C. gave up
D. tired of
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