Some birds have highly developed senses that enable them _ in the dark.A.to fly B.flying
问题描述：
Some birds have highly developed senses that enable them _ in the dark.A.to fly B.flying
为什么选a呢 除了固定用法以外
有没有语法归纳上的解释?
答
很高兴为你解答!
enable sb to do sth.使某人做某事
that定语从句修饰宾语senses.enable 是宾从谓语,them宾从宾语,to fly 宾语从句的宾补.