单项选择题

I think they are quite confident in their conclusion.

A. certain
B. worried
C. suspicious
D. doubtful
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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
单项选择题
The behavior is stemmed from his ide
a.A. flowsB. comesC. watchesD. observe
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