问题补充：
Not only interested in Beijing Opera but beginning to show an interest in it.
A. the father himself is; all his children are
B. the father himself is; are all his children
C. is the father himself; are all his children
D. is the father himself; all his children are
答案：
A. the father himself is; all his children are
B. the father himself is; are all his children
C. is the father himself; are all his children
(答案→)D. is the father himself; all his children are
解析：考查倒装。Not only... but also句型中的Not only位于句首时，Not only后用部分倒装，排除A、B；but also不到装，排除C。故选D。
