单项选择题

When Sarah and I ______ on an article for the school newspaper, we found it difficult to work together.

A. compiled
B. gathered
C. collaborated
D. collected
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单项选择题
During the summer vacation, Mary worked on a(an) ______ basis as a salesman, taking 8 percent of everything she sells.
A. salary
B. income
C. commission
D. pension
单项选择题
When they had finished reading, the children were told to ______ all the picture books they had taken out.
A. put up
B. put off
C. put away
D. put out
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