题目内容
So far, MERS(中东呼吸综合症) has become one of ____ illnesses in the world.
A. serious
B. more serious
C. the most serious
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题目内容
So far, MERS(中东呼吸综合症) has become one of ____ illnesses in the world.
A. serious
B. more serious
C. the most serious