问题
选择题
Alex has finally become an astronaut, __________all his family members think is his dream career.
A．which
B．who
C．that
D．whom
答案
答案：A
题目分析： 句意：Alex最后终于成为一名宇航员，所有的家庭成员都认为这是他梦想的事业。这里使用了非限制性定语从句，用which指代上文的内容，在定语从句中which做主语，that不能引导非限制性定语从句，所以选A。