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31. －A number of volunteers ____ willing to work in 2016 Rio Olympic Games this year. －Yes, it’s rep...
题目内容：
31. －A number of volunteers ____ willing to work in 2016 Rio Olympic Games this year.
－Yes, it’s reported that the number is getting ____.
A. is; bigger and bigger B. are; bigger and bigger
C. is; more and more D. are; more and more
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