You shouldn’t accept a gift from a person _____ you don’t know him.

You shouldn’t accept a gift from a person _____ you don’t know him.

A．until             B．unless            C．if                D．whether

You shouldn’t accept a gift from a person _____ you don’t know him.

1. A.
   until
2. B.
   unless
3. C.
   if
4. D.
   whether

 You shouldn’t accept a gift from a person _____ you don’t know him.

  A. until         B. unless         C. if         D. whether