Some people who don't like to talk much are not necessarily shy; they _____ just be quiet people.应该填哪个情态动词?求讲解

Some people who don't like to talk much are not necessarily shy; they _____ just be quiet people.应该填哪个情态动词?求讲解
Some people who don't like to talk much are not necessarily shy; they _____ just be quiet people.应该填哪个情态动词?求讲解

Some people who don't like to talk much are not necessarily shy; they _____ just be quiet people.应该填哪个情态动词?求讲解
我觉得是may