Question

--Peter doesn't know much French.

--______________.

1. A.
   So do I
2. B.
   So am I
3. C.
   Neither do I
4. D.
   Neither am I

Answer 1

C
如果原句为肯定句，则表示同意用so；如果原句为否定句，表示同意要用neither或nor，而且助动词根据原句来定，故选C．