Believe it or not,Jack has been to Beijing.为什么要用has been to,不用was to

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• 1.The bar would be ____ popular if it has air-conditioners.A.very B.rather C.much D.even 为什么不能用B呢?2.It is ____ impossible to solve the problem in this way.A.most B.much C.very E.quite为什么不能用C,D呢?3.In fact every possible means ____ to have the hero.A.have been tried B.have tried C.has tried D.has been tried为什么要用被动语态呢?两位提供的思路都让我受益！
• It`s the first time that he has been to Australia,isn`t it?中,为什么要用isn`t it,而不用hasn`t he?
• When a pencil is partly in a glass of water, it looks as if __A breaks B has broken C were broken D had been broken我知道正确答案是C,但不知道为什么要用were,pencil 不是单数吗?
• It`s the first time that he has been to Australia,isn`t it?中,为什么要用isn`t it,而不用hasn`t he?
• The plan has been gone throughzh中为什么要用been
• my grandmother is already eighty years old 为什么要用is 而不用has been
• in the past few years there( )great changes in my hometown为什么不用has been
• It has been snowy for two days为什么不用snowing
• the man has been dead for many years.为什么不用用died
• he looked as thoughhe___ill for a long time.were has been为什么用were 不用has been
• （ ）the first to use nuclear weaponsA.At no time China B.At no time be China C.At no time will china D.China will no time be答案为什么是 CC加个be
• the first man of letters指什么?整句是这样的：Washington Irving was the first man of letters from the US to win an international reputation.