闭袢性肠梗阻的特点是

A．腹部有不对称隆起

B．肠鸣音高亢时，有高调金属音

C．疼痛为阵发性剧痛

D．呕吐频繁

E．可排l叶j黏液血样便

How foolish I was!

_______ you have realised that, stop blaming yourself.

A．Now that

B．Unless

C．Although

D．Even if