for quite a few days, he had to go to hospital for further treatment.

A．Being ill                                                B．Falling ill

C．Having been ill                          D．To be ill

________ for quite a few days, he had to go to hospital for further treatment．

1. A.
   Being ill
2. B.
   Falling ill
3. C.
   Having been ill
4. D.
   To be ill

　　　for quite a few days， he had to go to hospital for further treatment.

A.Being ill  B.Falling ill  C.Having been ill  D.To be ill