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
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单项选择题
The director was critical______the way we were doing the work.
A．at
B．in
C．of
D．with
单项选择题
That sound doesn't______in his language, so it's difficult for him to pronounce it.
A．happen
B．occur
C．have
D．take place
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