单选题 When I got back, they had eaten the whole cake and just a few ______ were left on the plate.
【正确答案】 B
【答案解析】crumb碎屑，面包屑；grain谷物等的颗粒；drop液态滴状物；shred碎片，破布。句意：我回来时，他们都已经吃完了整个蛋糕，盘子里只剩下一点蛋糕碎屑。