英语选择 坐等.He is a teacher ___his lessons to make them more interesting .

题目

英语选择 坐等.He is a teacher ___his lessons to make them more interesting .
A varied
B varing
C to vary
D vary

答案

答案是B,但是你应该是打错单词了,vary作为动词原型,变为现在分词形式是应该在其后面直接加ing,即varying,而不是varing.
这里是现在分词表示伴随状态,vary这一动作的施出者是He ,a teacher,应该是主动的,所以用现在分词形式.
后半句的to make them more interesting .表示的是一种结果、目的,作为状语.
所以,我们可以把句子的主干看作是He is a teacher ___his lessons ,
再 简单点：He is a teacher .怎样的老师呢,就用现在分词短语来修饰 a teacher.
所以答案是B.