The efficiency and effectiveness是单数还是负数
问题描述:
The efficiency and effectiveness是单数还是负数
我想写The efficiency and effectiveness has还是have been improved significantly as the result of the great development of technology.
答
如果是我做的话应该是单数(错了别PIA我)
我认为如果是复数的话两个单词前应该都要加the的