答案B
定语从句的引导词,指人用who(作主语)whom(作宾语),指物用which(作主语和宾语),that既可指人又可指物,指地点用where,指时间用when,指所有格用whose.但在下列情况下,引导词只能用that：①先行词是复合不定代词时②先行词被序数词、形容词最高级、the last修饰时③先行词是或被all/no/some/any/little/much修饰时④先行词被the only/the very/the same修饰时⑤先行词是两个或多个分别表示人和物的名词时⑥主句是以who/which引导的特殊疑问句时⑦先行词是主句的表语或关系代词在定语从句中作表语时.