诊断考虑为
A．肛门旁皮下脓肿B．坐骨肛管间隙脓肿C．骨盆直肠间隙脓肿D．直肠后间歇脓肿E．直肠黏膜下脓肿
参考答案：B
--- Liu Tao has never read the book The Adventure of Tom Sawyer , _________ he?
--- _________. He told me it's very interesting. He'd like to read it again.
A．is; No, he isn't
B．has; Yes, he has
C．isn’t; Yes, he is
D．hasn’t; No, he hasn't
