几个改错!请在半小时内回答,来不及了!

几个改错!请在半小时内回答,来不及了!

题目
几个改错!请在半小时内回答,来不及了!
Up till now,I went to Paris three times.
I never read this book before.
Last summer I have seen him in the park.
He has been here half an hour ago.
When hve you gone th Bejing?
是改错!请问二楼,如果第一句是Up till now不动的呢?
答案
1.Up to now,I have been to Paris three times.2.I have never read this book before.3.Last summer I saw him in the park.4.He has been here since half an hour ago.5.When did you go to Beijing?
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