多项选择题

Putting as many as possible in the plural with other necessary alterations. The cheese could not be sold, as a mouse had left a tooth mark on it.

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单项选择题
Economics ______ among the college students.
A. is one of the basic courses
B. is the basic courses
C. are the basic courses
D. are one of the basic courses
单项选择题
May I have two ______ instead of beans, please
A. corn s ear
B. corn ears
C. ears of corn
D. ear of corns
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