试题题干
WORD FORMATIONS
Complete the following sentence with the proper form of the word in the bracket.
(profit) Drug manufacturing is the most 
business in America.
参考答案
试题解析
此处缺少形容词。
the most+形容词最高级。business是名词，形容词修饰名词。所以变profit为形容词形式profitable。
句意：在美国，制药类行业是利润最大的商业。