He was diagnosed with cancer last month, but he carried on with his work ______ nothing had happened.

A．even thought

B．as if

C．so that

D．in case

下面叙述中，左心房增大时的改变包括（）

A.在正位，左心缘第二、三弓之间突出一个小心弓

B.在正位，右心缘第二弓可见双重轮廓或双边阴影

C.左主支气管受压、上移，使支气管分叉角度开大

D.食管造影时，食管受压向后或向侧方移位

E.左侧位心后缘上半部突出延长