试题题干
WORD FORMATIONS
Complete each of the following sentences with the proper form of the word in brackets.
The recent decline of the stock market does not necessarily 
the start of a recession. (sign)
参考答案
试题解析
此处缺少动词。
does是助动词，所以后面缺少实意动词原形。sign是名词，所以变sign为动词signify，“预示”。
句意：股市的下跌并不一定预示着萧条的开始。