London, which is the capital of UK, is a very beautiful city这个句子怎么理解呢,为什么一个句子中会有两个is

Which river is the main source of London' water supply? which country is london in Which is the biggest country:the United Kingdom,France or Spain?Which river flow through London? The traffic in London is convenient,as which Beijing's is the same. Which of the following is true about London according to the passage的中文意思? Which cicy is the capital of the UK?( ) A.Washing DC B.London c.New York which country's captital is London? 关于定语从句连词?london is the city which I find the most interesting.为什么用which不用where? which city is different from the others?London,rome,beijing,Tokyo,New York,Mocow,Brussels,ottowa which city is different from the others?beijing tokyo cairo london moscow rome paris newyork Which city is the hottest in summer?A.Guanghzhou B.New York C.London Which city is the hottest in summer?A.Guanghzhou B.New York C.London the man___visited us today is from London.A.who B.which C.whom D.when A night club is one of the few places which stay open late in London London is the capital of( ) Which of the following is called the City of Music?A.paris B.London C.Rome D.Vienna which city is different from the other three?A .london B .new york C .PARIS D.ROME That is the cook ______ came from London.A.that B.which C./ D.whothat 怎么不行