问题

_____ that he picked up his uncle at the airport—It was at 6:00 in the afternoon _____ he got off work.
A:Was it when; that
B:When was it; that
C:Was it when; when
D:When was it; when;
B:When was it; that
C:Was it when; when
D:When was it; when;
正确答案是: