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】考查時(shí)態(tài)和語(yǔ)態(tài)。該句句意：“北京在2月24號(hào)處于‘橙色’霧霾預(yù)警之中，這表明由去年所引入的新系統(tǒng)中的二級(jí)警報(bào)等級(jí)已經(jīng)提高了。”這個(gè)警報(bào)系統(tǒng)是根據(jù)霧霾的水平來(lái)提高的，就像天氣預(yù)報(bào)那樣，如果有強(qiáng)臺(tái)風(fēng)來(lái)襲，氣象部門就會(huì)提高警報(bào)級(jí)別，警報(bào)級(jí)別不會(huì)自動(dòng)升高，故用及物動(dòng)詞raise的被動(dòng)語(yǔ)態(tài)，又根據(jù)marks所體現(xiàn)的一般現(xiàn)在時(shí)，且句中“ introduced last year”為后置定語(yǔ)修飾system，可知“現(xiàn)在已經(jīng)被提高了”，用現(xiàn)在完成時(shí)的被動(dòng)語(yǔ)態(tài)，故正確答案為A.

考點(diǎn)：時(shí)態(tài)和語(yǔ)態(tài)

 

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