After school I found Mother was in bed sick. _______ Mother was ill, I should do something for her.

A．So        B．Though             C．Since        D．If

After school I found Mother was in bed sick．________ Mother was ill, I should do something for her．

1. A.
   So
2. B.
   Though
3. C.
   Since
4. D.
   If

After school I found Mother was in bed sick．____ Mother was ill, I should do something for her．

A．So    B．Though    C．Since     D. If