3.A
改错题：
1.去掉has.现在完成时不与表示过去的时间状语连用.
2.We have never been to America before.
3.去掉have.同第一题.
4.去掉have.同上.
5.I finished my homework two hours ago
6.joined改成been in
7.arrived 改成been
8.去掉yet
9.gone改成been
10.Have you been to the club lately?
填空：
We know each other very well.We have known each other for .
haven't seen
haven't seen; visited
said或am saying都可以.
has stood
has made