He's already been to Tunisia, and is to go on to Morocco and Mauritania. [VERB prep./adv.]
他已经去过突尼斯了,还要去摩洛哥和毛里塔尼亚。
I've been there before. [VERB prep./adv.]
我以前去过那儿。
英汉双解词典包含141091条英汉词条,基本涵盖了全部常用单词的翻译及用法,是英语学习的有利工具。