Did you see the person-----new motorbike was stolen A.whom B

D.whose 为正确选项.
whose引导定语从句,先行词the person,关系代词在从句里做定语,修饰motorbike,所以用whose.
相关知识点：Did you see the person the new motorbike of whom was stolen?=Did you see the person whose new motorbike was stolen?
再问： Kate watches the Animal World______among the five children A.most regularly B.more regularly C.more regular D.regular谢谢！请问这题呢
再答： A.most regularly 考点：形容词或副词的最高级+among / of+复数名词，“XXX当中最。。。。”的意思。