It's the first time China has the great opptunity to hold th

不是的,要在time后面加才对
has应该是要改成had.因为前面It's=It was
整篇文章如果都是过去时就用it was,除了那些普遍存在的真理,比如The sun is mucher bigger than the earth.虽然是句废话,但很说明问题,只有这样不会随故事发生时间变化的客观事实,才不受文章整体时态影响.
The 29th olympics was held on _Aug 8th__,which lasted_(for)时间__
it was started on the luckiest day Aug 8th,2008.这句话我个人认为不用被动it started on the luckiest day Aug 8th,2008.好像就可以了