we are laid off all of us will have to be retrained and improve ourselves.A. UnlessB. So

问题补充：

we are laid off, all of us will have to be retrained and improve ourselves.

A. Unless

B. So that

C. Until

D. In case

答案：

A. Unless

B. So that

C. Until

(答案→)D. In case

解析：连词辨析。A除非,如果…不；B以至于；C直到…才；D以防；句意：以防我们被解雇，我们所有人都不得不再次被培训以提高我们自己。故D正确。