for it is impossible to foretell the exact nature of the difficulties which will confront the ..for it is impossible to foretell the exact nature of the difficulties which will confront the pot-holer.which will confront the pot-holer.（定语从句

for it is impossible to foretell the exact nature of the difficulties which will confront the ..for it is impossible to foretell the exact nature of the difficulties which will confront the pot-holer.which will confront the pot-holer.（定语从句
for it is impossible to foretell the exact nature of the difficulties which will confront the ..
for it is impossible to foretell the exact nature of the difficulties which will confront the pot-holer.
which will confront the pot-holer.（定语从句）
为什么不是：which the pot-holer will confront

for it is impossible to foretell the exact nature of the difficulties which will confront the ..for it is impossible to foretell the exact nature of the difficulties which will confront the pot-holer.which will confront the pot-holer.（定语从句
因为which 在定语从句中做主语
而你理解成了宾语
事实上,从句的宾语是pot-holer

what?