---Another cup of tea? That’s your third since lunch.
---Yeah, well, I ______ all night preparing for my history exam. I can hardly keep my eyes open.A.have stayed upB.stayed upC.have been staying upD.will stay up
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B解析试题分析：考查时态：句意：--还要一杯茶？这是午饭后的第三杯了。--是的，我整晚都熬夜准备历史考试。我眼睛都睁不开了。从That’s your third since lunch.说明现在是午饭后了，那熬夜是在晚上，属于过去时间，用一般过去时，选B。
考点：考查时态