It must have been after two o’clock in the morning when the last guests【C1】______their leave, and although we had enjoyed their

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问题    It must have been after two o’clock in the morning when the last guests【C1】______their leave, and  although we had enjoyed their【C2】______, my wife and I were quite thankful to shut the door【C3】______them. We left all the dirty dishes and glasses【C4】______, and after opening a few windows to let some fresh air in and the smell of【C5】______out, we climbed into bed and fell asleep.
   I【C6】______asleep for more than half an hour when I awoke with a strong smell of smoke in my nostrils(鼻孔).【C7】______half asleep, I【C8】______into the sitting room, and there, through【C9】______clouds of smoke, I saw that one of the curtains was【C10】______fire. I should have closed the windows then without delay, but【C11】______I tried to beat out the flames with a folded newspaper.【C12】______this failed I hastened into the kitchen to snatch a bucket(木桶)and【C13】______it with water. At the same time I shouted to Barbara, who【C14】______dialed  999 to call the brigade【C15】______coming to my aid. We had to work at top speed carrying buckets of water from the kitchen to prevent the flames,【C16】______by the breeze from the windows, from spreading. We【C17】______to extinguish the fire but we managed to keep it【C18】______in check until the arrival of the firemen. Fortunately, they promptly came and they had little difficulty【C19】______out the flames.
   For most of the【C20】______of the day we worked hard.  
【C6】

选项 A、mustn’t have been
B、must fall
C、couldn’t have been
D、might not have been

答案C

解析
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