He regretted the day ________ he wasted in the woods and ________ he should have studied.

1. A.
   when, when
2. B.
   that, when
3. C.
   when, that
4. D.
   that, that

He regretted the day _____ he wasted in the woods and _____ he should have studied. 
    A. when; when    B. that; when     C. when; that     D. that; that

He regretted the day ________ he wasted in the woods and ________ he should have studied.

[　　]