单项选择题

He spent______collecting materials for his article.

A. a half year
B. half year
C. half a year
D. half of a year
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单项选择题
The company has to______the benefits against the costs in the last three months.
A. boast
B. blame
C. block
D. balance
单项选择题
______by the look on her face, she didn't catch what I meant.
A. Judging
B. Judged
C. Judge
D. To judge
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