题干
_______ all these people have in common is ______ they have succeeded.
A：What; that
B：That; what
C：That; that
D：What; what
答案(点此获取答案解析）
A
A：What; that
B：That; what
C：That; that
D：What; what
＝a，C
＝b，|a|＝1，|b|＝2，则C
＝( )
