There are many good stories about the Long March, _________this is the most instructive.A.of whichB.in whichC.from whichD.by which

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There are many good stories about the Long March, _________this is the most instructive.
A.of whichB.in whichC.from whichD.by which

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.