It was lucky that little Jack was not at home when the fire broke out; otherwise, he____his life.

A．had lost

B．would lose

C．would have lost

D．might lose

脑栓塞最常见的栓子来源是（）。

A.肺静脉血栓

B.颈动脉粥样硬化斑块

C.心脏栓子

D.脂肪栓塞

E.寄生虫卵