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)中的二級警報等級已經(jīng)提高了．

解答 答案：A 考查現(xiàn)在完成時的被動語態(tài)．這個警報系統(tǒng)是根據(jù)霧霾的水平來提高的，就像天氣預(yù)報那樣，如果有強臺風(fēng)來襲，氣象部門就會提高警報級別，警報級別不會自動升高，用及物動詞raise的被動語態(tài)，又根據(jù)marks所體現(xiàn)的一般現(xiàn)在時，且句中"introduced last year"為后置定語修飾system，可知"現(xiàn)在已經(jīng)被提高了"，用現(xiàn)在完成時的被動語態(tài)，正確答案為A．B項：一般過去時，但缺少賓語；C項：現(xiàn)在完成時；D項：一般過去時．

點評 解答此類問題要了解各種時態(tài)的用法，然后根據(jù)上下文及結(jié)合語境給出正確答案．

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