—I  have  no  idea ____________   tell her  the  bad  news. 

—I think tomorrow is the best time.

A．how to

B．when to

C．how can I

D．when can I

断流术(贲门周围血管离断术)成败的关键是

A．冠状静脉食管支的离断
B．胃后静脉和左膈下静脉的离断
C．胃短静脉的离断
D．冠状静脉高位食管支的离断
E．冠状静脉胃支的离断