I’ve heard that our boss is to arrange me for a trade talk with another company, _____I can’t go picnicking with you on Sunday.

A. in this case　　　　 B. in that case　　　 C. in which case 　　D. in case

I've heard that our boss is to arrange me for a trade talk with another company, ________ I can't go picnicking with you on Sunday．

1. A.
   in this case
2. B.
   in that case
3. C.
   in which case
4. D.
   in case

I’ve heard that our boss is to arrange me for a trade talk with another company, _____I can’t go picnicking with you on Sunday.

  A. in this case         B. in that case       C. in which case     D. in case