单项选择题

Once the（）contradiction is grasped, all problems will be readily solved.

A. principle
B. principal
C. potential
D. primitive

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单项选择题
Two substitutes were used during the basketball games.
A. players
B. centers
C. referees
D. replacements
单项选择题
（）his sister, Jack is quiet and does not easily make friends with others.

A. Dislike
B. Unlike
C. Alike
D. Liking
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