单选题 Mark's Warehouse Clearance Store is having sale with savings of up to 40 percent off on all clothing this weekend ______ celebration of its 25th anniversary.

【正确答案】 A
【答案解析】本题需选择常用词组中的介词。“纪念…”的表达方式是in celebration of…，要留意介词in。想提高有关常用词组的题目的正确率，需要具备一定的语法知识和词汇量。