The window stayed open all night .为什么用keep open 不可吗

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• 1.When they got back home from the cinema last night,they found that the house____ into.A.was broken B.had been broken.break是点动词吗?不是的话怎么能持续呢2.---You seem sleepy,Tim.---Oh,I ___ all night preparing for the report and I can hardly keep my eyes open now.A.stayed up B.have been staying up这道题怎么又变成现在完成时了?3.He suffered from serious test anxiety.____,he could neither sleep nor eat well before the important exam.A.In that case B.As a result为什么不能用A?就是这样
• The window stayed open all night .为什么用keep open 不可吗
• ---Another cup of coffee?That's your third since lunch.---Yeah,well,I____all night preparing for my history exam.I can hardly keep my eyes open.A.stayed up B.have stayed up我搞不懂,不是说现在完成时可以用来表示过去对现在的影响吗?就是因为“昨天复习一个晚上历史”才导致今天“眼睛睁不开”是强调的过去的行为对现在的影响啊
• Another cup of coffee?That's your third since lunch- Year. well, I--- all night preparing for my history exam. I can hardly keep my eyes open.A stayed up B have stayed up C have been stayed up D will stay up为什么不选B,这不是对现在产生了影响吗?
• 在一副52张（没有大小王）的扑克中任意抽取一张,将下列事件发生的机会大小从小到大排列
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