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Beijing was under an “orange” smog alert...

Beijing was under an orange smog alert on Feb. 24, which marks the first time the second-highest warning level of a new system introduced last year________.

A. has been raised B. raised

C. has risen       D. rose

 

A 【解析】考查时态和语态。该句句意:“北京在2月24号处于‘橙色’雾霾预警之中,这表明由去年所引入的新系统中的二级警报等级已经提高了。”这个警报系统是根据雾霾的水平来提高的,就像天气预报那样,如果有强台风来袭,气象部门就会提高警报级别,警报级别不会自动升高,故用及物动词raise的被动语态,又根据marks所体现的一般现在时,且句中“ introduced last year”为后置定语修饰system,可知“现在已经被提高了”,用现在完成时的被动语态,故正确答案为A. 考点:时态和语态  
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