________hergrandmabe的精选

问题详情：________hergrandmabefore,hedidn’tknowshewashisgrandmaevenifhismotherhadtoldhim.（  ）A．NotbeingseenB．NothavingseenC．HavingnotseenD．Notseeing【回答】B知识点：动词时态与语态题型：选择题...