Analysis of test questions: This question mainly examines students' ability to solve problems by using what they have learned. The material emphasizes the fundamental motivation or reason of Shang Yang's political reform. Of course, the most fundamental condition for the implementation of Shang Yang's political reform is the change of economic base, that is, the development of feudal land ownership.

The answer is that A, B, C and D are the important driving forces of its reform.

Comments: The examination ideas of this question can also be carried out from the following angles:

The main reason why Shang Yang's political reform can become a more thorough reform and promote the social progress of Qin State is "one".

A, created a new system suitable for social and economic development B, fundamentally established the private ownership of land.

C, cracked down and disintegrated the old blood clan system D, and strengthened the household registration system managed at the grass-roots level.