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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Following are comments about the behavior that people in Korea usually expect in various social（）

A. occasions
B. cases
C. situations
D. circumstances
单项选择题
We have finished the course, （） we shall start doing more revision work.

A. For now
B. Since that
C. Now that
D. By now
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