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

A.of which

B.during which

C.from which

D.for which

答案及解析： 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。