答案应为:in order to
由语意可知,大多数学生买英语学习机的目的是学好英语.
in order to表示为了或者目的是,
A so that“以便,为了”,引导一个表示目的的状语从句,此时可与 in order that 换用.例:
My old father began to study computer at the age of sixty so that(= in order that) he might keep up with times. 父亲六十岁时才开始学习电脑,以便跟上时代.
learn English well 显然不是从句,所以不合适.
because 表示原因.
that 作为代词一般引导从句,也不合适.