患者男性，65岁，呼吸困难，心前区不适；查体有奇脉、颈静脉怒张；听诊心音遥远；X线示心影增大呈“烧瓶”状；超声提示心包积液

若出现心脏摆动征，心包腔内无回声区宽度应为（）。

A.10～20mm，包绕整个心脏

B.5～10mm，主要局限于左室后下壁区域

C.3～5mm，主要局限于左室后下壁区域

D.2～3mm，局限于房室沟附近的左室后下壁区域

E.<2mm，局限于房室沟附近的左室后下壁区域

______ time ______, what the scientist said finally proved to be true.

A．With; went by

B．With; going by

C．As; goes by

D．As; going by