He is ___ of those boys who is willing to take on another assignment.

题目

He is ___ of those boys who is willing to take on another assignment.
A.the only one B.only one C.one D.a

答案

选择A the only one
B 缺少the 修饰唯一的要加定冠词
通过后来的is表示他是唯一一个,所以不是one of 其中之一