has become是什么时态

　　Thailand has become the tourist mecca of Asia.

　　泰国已经成为亚洲旅游胜地。

　　The Internet has become part of everyday life.

　　互联网已成为日常生活的一部分。

　　Since her death, she has become a cult figure.

　　她死后已成为人们顶礼膜拜的人物。