All of us have already known she will choose is the opportunity to go abroad.
A. this
B. what
C. which
D. that
网友回答
A. this
(答案→)B. what
C. which
D. that
解析：考查名词性从句。known后跟的是宾语从句， she will choose is the opportunity to go abroad是宾语从句部分，choose缺少宾语，用what引导宾语从句，宾语从句中包含一个主语从句，what she will choose是主语从句，故选B。