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
网友回答
A. how ,after
B. why, when
C. when, before
(答案→)D. why, since
解析：考查连词。我真的很想知道自从并不在一起工作后，他寄给我许多包裹。since引导的从句中用过去时，主句用现在完成时。