一英语单选,希望给予详解

题目

一英语单选,希望给予详解
The employer worked his men almost _____ collapse.
A to the extent of B to the point of
C on top of D in spite of
都给我讲讲ABCD这四个选项是什么意思吧?

答案

B
to the extent of [简明英汉词典]
到...的程度
to the point of [简明英汉词典]
adv.达到...的程度
on top of [简明英汉词典]
adv.熟练掌握,在...之上,另外,紧接着
in spite of [简明英汉词典]
adv.不管