As everybody knows Hong Kong used to be part of British EmpireA. 不填; aB. a; the C. 不填;

问题补充：

As everybody knows, Hong Kong used to be part of British Empire．

A. 不填; a

B. a; the

C. 不填; the

D. the; 不填

答案：

A. 不填; a

(答案→)B. a; the

C. 不填; the

D. the; 不填

解析：the British Empire 大英帝国