-Why do you think          ?        

-Maybe he missed the bus.                [ ]

A. the man was late                    

B  was the man late                

C. he feels disappointed                  

D. that he felt exited

下面不能控制生理性运动伪影措施是（）

A.采用心电门控技术

B.采用呼吸门控技术

C.缩短检查时间

D.预饱和技术

E.增加对比剂剂量