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單項(xiàng)選擇題

【A1型題】哮喘患兒血?dú)庵蠵aCO₂下降提示（）

A.痰液部分阻塞
B.哮喘緩解
C.病情嚴(yán)重
D.哮喘發(fā)作初期
E.與哮喘無關(guān)

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The new suspension bridge （）by the end of last month.

A.has been designed
B.had been designed
C.was designed
D.would be designed

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