问题补充:
There are many good stories about the Long March, this is the most instructive.
A. of which
B. in which
C. from which
D. by which
答案:
(答案→)A. of which
B. in which
C. from which
D. by which
解析:考察定语从句。本题定语从句的先行词是many good stories,后面的定语从句中句子结构很完整,故使用关系副词where,在定语从句中关系副词=介词+关系代词。本句是指在这些故事中,这是最有教育意义的。故使用of表示所属关系。故A正确。