The new supermarket announced that the first to purchase goods on the opening day get a bi

问题补充：

The new supermarket announced that the first to purchase goods on the opening day get a big prize.

A. must

B. will

C. shall

D. need

答案：

A. must

B. will

(答案→)C. shall

D. need

解析：

试题分析:句意：新开业的超市宣布开业当天首先购物的人会得到大奖。A必须；B将；C将；D需要。Shall 用于二三人称的陈述句中可以表示说话人的承诺，命令，警告等，根据句意判断此处表示超市的承诺，故选C。