患者，男性，21岁，突发右侧胸痛1小时，伴呼吸困难、大汗。查体：右侧胸廓饱满，右肺呼吸音消失。

其最可能的诊断（）。

A.慢性阻塞性肺疾病

B.急性心力衰竭

C.哮喘

D.大叶性肺炎

E.自发性气胸

Mr. Cui told us whether ______ a picnic was still under discussion.[ ]

A. to have

B. having

C. have

D. had