单项选择题

He is certain that the dictionary is just what I want.

A. sure
B. angry
C. doubtful "
D. worried
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单项选择题
They didn’t realize how serious the problem was.
A. know
B. forget
C. doubt
D. remember
单项选择题
There are only five minutes left, but the outcome of the match is still in doubt.
A. result
B. judgement
C. estimation
D. event
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