—I’d like to invite you to my new house next weekend.
—Thank you, but ____ I’ll have time I’m not sure at the moment

1. A.
   when
2. B.
   as
3. C.
   in case
4. D.
   unless

—I’d like to invite you to my new house next weekend.

—Thank you, but ____ I’ll have time I’m not sure at the moment.

A. when                  B. as                   C. in case             D. unless

—I’d like to invite you to my new house next weekend.
—Thank you, but ____ I’ll have time I’m not sure at the moment.