单项选择题

The British constitution is ______ a large extent a product of the historical events described above.

A．within
B．to
C．by
D．at
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单项选择题
The board of the company has decided to ______ its operation to include all aspects of the Clothing business.
A．extend
B．enlarge
C．expand
D．amplify
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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