[答案]
Wereyou inthebookstorealldaytoday?
[解析]
考查转一般疑问句。原句为一般过去时的陈述句,转为一般疑问句,将be动词was提到句首,主语为I,改为对应的一般疑问句应为you,be动词对应were,were放在句首,首字母应该大写。句子可以改写为:Were you in the bookstore all day today?
故答案为:Were you in the bookstore all day today?
[点评]
本题考查了"陈述句与一般疑问句转换,",属于"基础题",熟悉题型是解题的关键。