They can find whatever they need in the supermarket, is always busy on Sundays.A. whichB.

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(答案→)A. which
B. when
C. where
D. who
解析：句意：他们可以找到他们所需要的任何东西在那个超市，那里星期天总是很忙。这里定语从句的关系代词which，代替先行词物the supermarket，做主语；关系副词when做从句的时间状语；where关系副词做从句的地点状语；当先行词是人时，用关系代词who。做主语或宾语表语等。故选A。
考点: 考查非限制性定语从句的用法。