单项选择题

America will never again have as a nation the spirit of adventure as it ______ before the West was settled.

A．could
B．did
C．would
D．was
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单项选择题
According to official statistics, retail sales in China rose 10% and 12.2% in the first and the second quarter ______ this year.
A．accordingly
B．correspondingly
C．respectively
D．individually
单项选择题
Nowhere in nature is aluminum found free, owing to its always ______ with other elements, most commonly with oxygen.
A．being combined
B．having combined
C．to combine
D．combined
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