下列做法存在安全隐患的是[ ]

A．炒菜时油锅着火，立即盖上锅盖

B．厨房内闻到较浓的燃气味，立即关闭阀门并开窗通风

C．电器着火赶紧用水扑灭

D．手持燃着的蜡烛进入溶洞游览，发现烛光变弱或熄灭立即退出

—How long have you been doing that?

—Since I       her for the first time.

A．meet

B．met

C．have met

D．had met