题干
--How many times he abroad before? --Never.
A：has ; been to
B：has ; been
C：has ; gone to
D：has ; gone
答案(点此获取答案解析）
B
--How many times he abroad before? --Never.
A：has ; been to
B：has ; been
C：has ; gone to
D：has ; gone
的活动的基础，只能是自然物及其固有的属性和变化发展的规律