问题补充:
My dad Singapore for a meeting. He there twice.
A. has gone to, has been to
B. has been to, has gone to
C. has gone to, has been
D. has been to, has gone
答案:
A. has gone to, has been to
B. has been to, has gone to
(答案→)C. has gone to, has been
D. has been to, has gone
解析:句意:我的爸爸去新加坡开会了。他已经去过那儿两次了。结合语境可知前文强调的是现在已经完成的动作,故用瞬间动词。下文描述的是到现在已经完成的过去某种状态,there在本句中是地点副词,前面不要介词,故选C。