— I stayed at a hotel while in New York .

— Oh , did you ? You ____ with Barbara .

—

A．could have stayed

B．could stay

C．would stay

D．must have stayed

发生化学性爆炸的必要条件是，（）。

A.可燃易爆物

B.与空气混合形成爆炸性混合物

C.着火源

D.温度

E.压力