As we know England is European country and Singapore is Asian country. A. an; anB. an;

问题补充：

As we know, England is European country and Singapore is Asian country.

A. an; an

B. an; a

C. a; a

D. a; an

答案：

A. an; an

B. an; a

C. a; a

(答案→)D. a; an

解析：句意：众所周知，英国是一个欧洲国家，而新加坡是一个亚洲国家。前文European 词首音素是辅音，故不定冠词用a，下文Asian词首音素是元音，故不定冠词用an。选D。