单项选择题

John is collaborating with Mary in writing an article.

A. cooperating
B. competing
C. combining
D. arguing
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单项选择题
He talks tough but has a tender heart.
A. heavy
B. strong
C. kind
D. wild
单项选择题
The union representative put across her argument very effectively.
A. explained
B. invented
C. considered
D. accepted
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