第1个回答 2006-11-20
There are so many kinds of summer schools that I really don't know (which)school to choose.
第2个回答 2006-11-20
There are so many kinds of summer schools that I really don't know how to choose.
第3个回答 2006-11-20
There are so many kinds of summer schools that I really didn\'t know which one to choose.
第4个回答 2006-11-20
There are so many kinds of summer schools that I really don't know which to choose.
第5个回答 2006-11-20
There are so many kinds of summer shchools that I don\'t know how to choose them.