have you been to an aquarium?这里为什么要加an?去掉an 可不可以?

Have you ever been to an english-speaking country?英译汉 Have you ever been to an amusement park? have you ever been to an amusement park?意思. have you ever been to an amusement?是什么时态 Have you been to an aquarium ever可以去掉吗? Have you been to? have you been to an aquarium?这里为什么要加an?去掉an 可不可以? Have you been to an amusement park?have/has been to sp的句型（没有ever） Have you been to the cinema?- yes,I have.I_____there an hour ago. have you been to Beijing Have you been to Americe? Have you been to America have you ever been to an aquarium? have you ever traveled to an other province 为什么一个加been一个不加啊 You have ever been to an amusement park.(改为否定句)You _____ ______ ______ to an amusement park. Write an article to advertise your home town ir a place you have been to. 11.Have you ever _________ an aquarium?A.gone B.gone to C.been to D.been应该选哪个? write an essay about a piace you have ever been to.什么意思 have you ever been to an amusement park.这一课涉及到的语法讲一下谢谢.