Question

He has studied this subject _______.

1. A.
   for detail
2. B.
   into detail
3. C.
   in great detail
4. D.
   for much detail

Answer 1

C
根据句子内容推测，可知句意应为“他已详细研究了这个课题”。表达“非常详细地”这一意思应用in detail。detail前可用much, great等修饰。