单项选择题

Our civilization cannot be thought of as（）in a short period of time.

A. to have been created
B. to be created
C. having been created
D. being created

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单项选择题
（39）（）

A. to sleep
B. being slept
C. having slept
D. sleeping
单项选择题
（）native to North America, corn has now spread all over the world.

A. In spite of
B. That it is
C. It was
D. Although
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