So the theories of the schools are different from the practice of ordinary business that much of which he learned in the former will have to be unlearned in the latter.

• A. Are the theories of the schools so different <br/>
• B. Are so different the theories of the schools <br/>
• C. So different the theories of the schools are <br/>
• D. So different are the theories of the schools <br/>

正确答案：D