问题
选择题
Unrest and violence in North Africa and the Middle East ____ at their fastest rate since 2008. [ ]
A. have been raising
B. have been rising
C. have raised
D. have risen
答案
答案：B
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Unrest and violence in North Africa and the Middle East ____ at their fastest rate since 2008. [ ]
A. have been raising
B. have been rising
C. have raised
D. have risen
答案：B