Some people who don’t like to talk much are not necessarily shy；they just be quiet people

问题补充：

Some people who don’t like to talk much are not necessarily shy；they just be quiet people.

A. must

B. may

C. should

D. would

答案：

A. must

(答案→)B. may

C. should

D. would

解析：考察情态动词的用法.前半句为” 有些人不喜欢讲很多话未必就是因为害羞,”后半句应该为”他们可能是比较安静的人.”