Question

---Shall we go on working?

---Yes, ______ I prefer to have a rest．

1. A.
   when
2. B.
   if
3. C.
   because
4. D.
   though

Answer 1

D
句意为“尽管很想休息，但是还要继续工作”，用though（＝although）表示让步，引导让步状语从句。