4．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 raisedB．raisedC．has risenD．rose

分析 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．

解答 答案：A 考查現(xiàn)在完成時(shí)的被動(dòng)語(yǔ)態(tài)．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(mén)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，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)，正確答案為A．B項(xiàng)：一般過(guò)去時(shí)，但缺少賓語(yǔ)；C項(xiàng)：現(xiàn)在完成時(shí)；D項(xiàng)：一般過(guò)去時(shí)．

點(diǎn)評(píng) 解答此類問(wèn)題要了解各種時(shí)態(tài)的用法，然后根據(jù)上下文及結(jié)合語(yǔ)境給出正確答案．

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