问题补充:
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:
A. on behalf of
B. regardless of
(答案→)C. on the basis of
D. in relation of
解析: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。