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
But in the end he approved of our proposal.
A. undoubtedly
B. certainly
C. ultimately
D. necessarily
单项选择题
The food is insufficient for three people.
A. instant
B. infinite
C. inexpensive
D. inadequate
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