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【单选题】
哮喘持续状态是指严重哮喘发作持续A.
48小时以上
B.
36小时以上
C.
72小时以上
D.
24小时以上
E.
一以上
拍照语音搜题，微信中搜索"皮皮学"使用
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A.
has been broken
B.
was broken
C.
broke
D.
breaks
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