kate is slim .kate's sister is slimmer.合并成一句 kate's sister is ____ _____ of the two girls.

kate is slim .kate's sister is slimmer.合并成一句 kate's sister is ____ _____ of the two girls.
kate is slim .kate's sister is slimmer.合并成一句 kate's sister is ____ _____ of the two girls.

kate is slim .kate's sister is slimmer.合并成一句 kate's sister is ____ _____ of the two girls.
the slimmest

the slimmer

Kate is slim. Kate's sister is slimmer.
合并成一句：Kate's sister is (the slimmer) of the two girls.

Kate's sister is the slimmest of the two girls .

the slimmest

这是英语语法比较级的用法,填the slimmer。