如果B 改成That可以吗 假如有一个词组是signs of incipient trouble One和that是核心词指代还是词组指代呢

录音里面老师是用借此短语修饰不太好，排除了D选项，可是我在做题的时候用，首先看到单复数问题，于是找暗示，看到后面未划线部分是 that of ,于是觉得应该是单数，就选了D For the last five years the Dutch economy has grown faster than Britain, France, or Germany, with the unemployment rate having remained well below that of the other three countries. Britain, France, or Germany, with the unemployment rate having remained have those of Britain, France, or Germany, and the unemployment rate remaining have Britain, France, and Germany, and the unemployment rate has remained the economy of Britain, France, and Germany, with the unemployment rate that has remained the economies of Britain, France, and Germany, and the unemployment rate has remained

这到题 我剩了 DE 字面上区别有ti do 和for doing觉得to do 表示还没做 选了e

如果c换成have those of Britain, France, and Germany, and the unemployment rate has remained，怎么选，什么时候加have，什么时候不加。