Question

The journey around the world took the old sailor nine months, ________ the sailing time was 226 days．

1. A.
   of which
2. B.
   during which
3. C.
   from which
4. D.
   for which

Answer 1

A
做此类题先找先行词，然后把先行词代入定语从句。本题先行词是nine months，因此，本句可以改成两个单句：The journey around the world took the old sailor nine months．The sailing time of nine months was 226 days。