had been doing是什么是时态?

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• would you like some pears?--No,thanks.I think there ___ enough for usA.is B.are C,has been D.had beenc是不是应该改为have been因为pears 是复数,B也错了,因为要用完成时态请问,你觉得呢?
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• 50.The Great Wall in China is one of the wonders of the world.Wonders固定的吗,surprises,amusements,greats 可不可以?51.I am going to hang a new picture on this wall.Suspend也有悬挂之意,可否替代?52.The criminal was hanged for the crimes he had committed.这里的hang是什么意思53.The mountain village cannot be reached by telephone yet.Reached可以用arrived at 替代吗,get to 是固定的吗?54.He wanted to turn sand to gold.to是表目的吗?55.The monster turned out to be a man in a blanket.56.The toy was repa
• 两道2012辽宁高考英语单选题,求答疑33.Jack is a great talker.It's high time that he_______ something instead of just talking..It's high time that 啥意思?A.will do B.has done C do Ddid（答案D,我选A）35.Mum,I was wondering if you could lend me a few dollars until I __________ on Friday.A.get paid B.got paid C have paid D had been paid（答案是A,我选B）get ,have 搭配词组有啥区别?最好每个选项都能解释下~
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• 非谓语动词/高三/英语 I smell something _ in the kitchen.Can I call you back in a minute?①I smell something _ in the kitchen.Can I call you back in a minute?A.burning B.burnt C.being burnt D.to be burnt②At the beginning of class,the noise of desks _ could be heard outside the classroom.A.opened and closed B.to be opened and closed C.being opened and closed D.to open and close第一题答案为A,我错选了C.第二题答案为C.易错选为A.以下是我的疑惑：这两题的非谓语动词中,doing/being done/done 三者的区别是什么?我印象中是这样的.
• We had never been there before翻译
• I have never ( ) there.用gonn和been填空请写出为什么