______ had I opened the cage than out flew the lovely bird.

A．No sooner

B．Hardly

C．Scarcely

D．As soon as

0.05mol某两种烃的混和物在足量O₂中完全充分燃烧，产物依次通过足量浓硫酸和碱石灰，增重分别为

2.7g和5.5g。则此混和物可能为[ ]

A．CH₄ C₄H₁₀

B．C₂H₂ C₄H₁₀

C．C₂H₄ C₄H₁₀

D．C₂H₆ C₃H₆