题目

古语云：“春种一粒粟，秋收万颗籽。”据我国考古发现，中国古代最早种植粟并把它 加工成小米的原始人类是    A．北京人         B．山顶洞人      C．河姆渡原始居民    D．半坡原始居民           答案：D______ that Richard could not come, Doris would never have given the party.A．If she knew B．Did she knowC．She had known D．Had she known