I really wonder__________ he has posted me many parcels___________ we didn’t work together.

A. that; before   B. which; since    C. X; when   D. that; since

I really wonder__________ he has posted me many parcels___________ we didn’t work together.

1. A.
   that; before
2. B.
   which; since
3. C.
   X; when
4. D.
   that; since

 I really wonder__________ he has posted me many parcels_________ we didn't work together.
　　A. how ,after         B. why, when      C. when, before       D. why, since

I really wonder____ he has posted me many parcels_____ we didn't work together.