题目内容
15．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 |
分析 到目前为止，中东呼吸综合症已经成为了世界上最严重的疾病之一．
解答 答案：C
根据"one of _ illnesses"可知，这里应该用形容词的最高级形式，A．serious是形容词的原级 B．more serious是serious的比较级形式 C．the most serious是serious的最高级形式，故答案为C
点评 做这道题要先根据句中现有词语确定应填词语的适当形式，然后选出正确的选项．
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