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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单项选择题
In American universities, classes are often arranged in more flexible ______ and many jobs on campus are reserved for students.
A. scales
B. ranks
C. grades
D. patterns
单项选择题
By the end of next month we ______ this assignment.
A. will finish
B. will be finishing
C. will have finished
D. have finished
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