男性，22岁。打篮球时突感左侧胸闷、胸痛、气促、出冷汗。查体：神志清楚，面色苍白，唇发绀，呼吸26次／分，左上肺叩诊呈鼓音，呼吸音消失，心率110次／分，律齐。

最可能的诊断是（）。

A.心绞痛

B.胸膜炎

C.带状疱疹

D.自发性气胸

E.肋间神经炎

Only when he arrived home _____ that he had left his key in the office.

A．will he realize

B．he did realize

C．did he realize

D．should he realize