Lucy is girl of the twin sisters.A. tallB. tallerC. the tallerD. the tallest

问题补充：

Lucy is girl of the twin sisters.

A. tall

B. taller

C. the taller

D. the tallest

答案：

A. tall

B. taller

(答案→)C. the taller

D. the tallest

解析：联系下文of the twin sisters可知本句表示在两个人当中进行比较，故用形容词的比较级，选C。