求助高手:英语单选题分析
1、NotuntilMarystartedtowork__toknowhowimportantagoodeducationwas.
A.didshebeginB.shebeganC.hadshebegunD.shehadbegun__
2、though__nottoreadinpoorlighttimeandtimeagain,theboystilldoesit.
A.warmingB.warnedC.beingwarnedD.havingwarned