问题
选择题
Long ago, man used to ______ with his hands but now man is used to ______ with machines, and sometimes a robot is used to ___ instead of people.
A．work, working, work
B．work, working, working
C．working, work, working
D．working, work, work
答案
答案：A
题目分析：原文意思，很久以前，人类常常用双手劳动，但是现在人们习惯了使用机器，有时候机器人被用来工作，代替了人。used to do sth. 过去常常干某事（现在已不再这样），be used to (doing) sth. 习惯于干某事（to为介词），be used to do sth.被用来干某事，故选A。
点评：解答此类题型一定要掌握各句型的基本意思，used to do sth. 过去常常干某事（现在已不再这样），be used to (doing) sth. 习惯于干某事（to为介词），be used to do sth.被用来干某事。