Question

How much do you want for the book? Two dollars______ enough, I think.

1. A.
   are
2. B.
   is
3. C.
   was
4. D.
   were

Answer 1

B
本题主要考查主谓一致。根据句意用一般现在时，排除C/D ,Two dollars作为整体作主语谓语动词用单数形式，故选B。