这几道现在完成时的题怎么做呢?
1、-( )you ever ( ) shanghai?
-Not yet!ti's such abeautiful city
2、-where is Tina?
-she ( )an aquarium.she will be back in half an hoar.
3、 -how long ( )you( )( )shanghai
-I ( ) there for about 6 weeks.