Sofar,MERS(中东呼吸综合征)hasbecomeoneof

问题详情：

So far, MERS(中东呼吸综合征)has become one of ______

illnesses in the world.

A．serious　B．more serious　C．the most serious

【回答】

C

知识点：形容词最高级

题型：选择题