________ more and more companies closed down, ________ number of laid-off people is increasing year by year．

1. A.
   With;the
2. B.
   For;a
3. C.
   Since;the
4. D.
   Because;a

______ more and more companies closed down, _____ number of laid-off people is increasing year by year．

A．With; the          B．For; a           C．Since; the            D．Because; a