단어장에 나온 문장인데요(下)

when king edward viii of england decided he would rather be married to wallis warfield simpson, an american divorcee, than be king of england, he returned in his crown and abdicated.

에서 be king of england에서 be와 king 사이에 the 나 a가 들어가야 되지 않나요?

왜 안 들어가나요?