问题
选择题
After a long walk, they were _______tired that they could not move even one step further.
A．too
B． as
C．so
D．such
答案
C
题目分析：考查固定句型。句意：经过散步之后，他很累以致于他们不想多走一步。So adj/adv that sb could do 如此以致于，，故选C项。
考点 : 考查固定句型
