The guide showed the visitors a store ________ they may buy all ________ they need．A.which;thatB.that;whichC.where;thatD.where;which
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C解析a store后面接的是一个限制性定语从句，这个定语从句的先行词就是a store，从句的主语和谓语(动词+宾语)都齐全，所以引导词在从句中充当地点状语；all后面的从句也是定语从句，all为先行词时，引导词要用that, that可以省略。所以