当前位置：首页 >
基础英语(00088) > 正文内容
American ingenuity and science are constantly ________ improving the quality of products.
American ingenuity and science are constantly ________ improving the quality of products.
A.for work
B.with work
C.at work
D.in work
正确答案是C
扫描二维码免费使用微信小程序搜题/刷题/查看解析。
版权声明：本文由翰林刷题小程序授权发布，如需转载请注明出处。