. –Hi, Mary. Would you like to go to the concert this evening?

--Sorry, Tom.         Tomorrow’s lessons, I have no time to go out with you.

A．Not preparing

B．Not having prepared

C．Not to prepare

D．Being not prepared

诊断急性阑尾炎不可能有的阳性体征

A．Roosing　sign

B．腰大肌试验

C．闭孔内肌试验

D．Murphy　sign

E．经肛门直肠指诊