國文屋Beijingwasunderan“orange”smogalertonFeb.24,whichmarkst...
問題詳情：
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. raised B. has been raised C. rose D. has risen
【回答】
B
知識點：動詞時態與語態
題型：選擇題
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在下列向量組中，可以把向量表示出來的是（ ）A B. C. D.
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