题干
– Where is your father now?
– He _____Hongkong. He____ there for three days.
A：has gone to, has been in
B：has been to, has been
C：has gone to, has been
D：has been to, has been in
答案(点此获取答案解析）
C
和
分别过定点A,B，则|AB|等于