【答案】It is wise of you to well-trained workers

题目：
It is wise of you to          well-trained workers            untrained ones in the assembly line. [     ] A. substitute; for B. substitute; with C. replace; by D. replace; with

答案

A

考点名称：动词

动词的定义： 表示动作中状态的词叫做动词。根据其在句中的功能，动词可分为行为动词、系动词、助动词和情态动词四类，有些动词是兼类词。 例如：We have lunch at 12. (have是行为动词) We have been to NewYork. (have是助动词) I am hungry. (am是系动词) You need not have waited for me. (need是情态动词) The door needs painting. (need是兼类词)