The flowers were  so lovely that they        in no time.[ ]

A. sold        

B. had been sold    

C. were sold    

D. would sell

男，3岁，在独自游戏时突然出现刺激性咳嗽，呼吸困难，其病因最可能是

A．大叶性肺炎

B．自发性气胸

C．左心衰竭

D．气管异物

E．右心衰竭