提示右心功能不全体征（）

A.肺动脉瓣区第二音亢进

B.剑突下示心脏抬举性搏动

C.心浊音界缩小

D.颈静脉充盈

E.双下肺湿啰音

—The problem wasn’t difficult for him,was it?

—No,it wasn’t.He      a more difficult one.

A．should have been given

B．ought to be given

C．would have been given

D．must be given