试题题干
WORD FORMATION
Complete the following sentence with the proper form of the word in the bracket.
(invest) Many of the more reputable green products, however, represent very large
in research and design, and in new materials and technology.
参考答案
试题解析
此处缺少名词。
large是形容词，用来修饰名词，所以空格处填invest的名词形式investment。
句意：然而，很多名牌的绿色产品都代表着在研究与设计，材料与技术方面的巨大投资。