Don't call me at eight o'clock tomorrow morning, for I ________ a meeting then.[ ]

A. will have  

B. will be having

C. will have had  

D. am going to have

为明确诊断，应首选下列哪项检查

A．下肢X线片

B．超声心动图

C．下肢静脉造影

D．下肢动脉造影

E．下肢动脉彩色多普勒检查