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求该英语选择题答案及原因(尤其是A.B两个选项)Beijingwasunderan'or求该英语选择题答案及原因(尤其是A.B两个选项)Beijingwasunderan'orange'smogalertonFeb.24,whichmarksthefirsttimethesecond-highestwar

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求该英语选择题答案及原因(尤其是A.B两个选项) Beijing was under an 'or
求该英语选择题答案及原因(尤其是A.B两个选项)
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
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答案和解析
你总不可能是过去式后面跟过去式吧