—Is girl in white your sister? —Yes. She is a nurse and works in hospital.A. the; /B. a;

问题补充：

—Is girl in white your sister?

—Yes. She is a nurse and works in hospital.

A. the; /

B. a; the

C. the; a

D. a; a

答案：

A. the; /

B. a; the

(答案→)C. the; a

D. a; a

解析：根据后置定语in white可知前文特指某一个女孩，用定冠词；下文她在一家医院工作。可知是泛指任何一家医院，故用不定冠词。选C。