I don't know why she's looking at me ______ she knew me. I've never seen her before in my life. [ ]

A. as

B. although

C. even if

D. as if

在电子点火系统中，发动机起动时的点火提前角，采用（）提前角.

A.初始点火

B.基本点火

C.修正点火

D.由电脑确定的最大点火