----Another cup of coffee?That's your third since lunch.------Yeah,well,I_A___all night preparingfor my history exam.I can hardly keep my eyse open.A stayed up B will stay up为什么不选B呢?

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----Another cup of coffee?That's your third since lunch.------Yeah,well,I_A___all night preparingfor my history exam.I can hardly keep my eyse open.A stayed up B will stay up为什么不选B呢?

----Another cup of coffee?That's your third since lunch.------Yeah,well,I_A___all night preparingfor my history exam.I can hardly keep my eyse open.A stayed up B will stay up为什么不选B呢?
----Another cup of coffee?That's your third since lunch.------Yeah,well,I_A___all night preparing
for my history exam.I can hardly keep my eyse open.
A stayed up B will stay up
为什么不选B呢?

----Another cup of coffee?That's your third since lunch.------Yeah,well,I_A___all night preparingfor my history exam.I can hardly keep my eyse open.A stayed up B will stay up为什么不选B呢?
整个意思是.又一杯咖啡?这是你开始午餐后的第三杯咖啡.是的,我昨天熬了个通宵做准备工作.
所以是过去时,选择A

因为他指的是前面的一天晚上一直在忙工作,所以是过去时,选a