单项选择题

The director was critical ______ the way we Were doing the work.

A. at
B. in
C. of
D. with
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单项选择题
He is ______ about his chances of winning a gold medal in the Olympics next year.
A. optimistic
B. optional
C. outstanding
D. obvious
单项选择题
Parents have a legal ______ to ensure that their children are provided with efficient education suitable to their age.
A. impulse
B. influence
C. obligation
D. sympathy
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