问题
选择题
The book was written ______ careful observations and detailed studies.
A．on behalf of
B．regardless of
C．on the basis of
D．in relation of
答案
答案：C
题目分析：A. on behalf of代表，B. regardless of不管，不顾，C. on the basis of在…基础上，D. in relation of关于，句意：这本书是在仔细的观察和详细的研究的基础上写的。根据句意选C。