单项选择题

John is collaborating with Mary in writing an article.

A. cooperating
B. marrying
C. combining
D. arguing
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单项选择题
Many economists have given in to the fatal lure of mathematics.
A. error
B. puzzle
C. attraction
D. contradiction
单项选择题
The river widens considerably as it begins to turn west.
A. extends
B. stretches
C. broadens
D. bends
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