(19) My father is a programmer and he works in ________.A.computer B.computers C.a computer
问题描述：
(19) My father is a programmer and he works in ________.A.computer B.computers C.a computer
应该填什么
答
填 B
work in computers,意思是：在计算机行业工作.
比如：
Mary's parents are/work in computers.
玛丽的父母从事计算机行业.为什么要加s呢这是个固定用法啊，在计算机行业