In no case ________ what you have done for us and at no time ______ your kindness. .      [ ]

A. I shall forget; I will forget          

B. shall I forget; shall I forget    

C. shall I forget; I shall forget          

D. forget I shall; forget I shall

左前斜位上，心后间隙消失见于（）。

A.左心房增大

B.左心室增大

C.右心房增大

D.右心室增大

E.二尖瓣狭窄