18. They have produced (   ) they did last year. 

• A、 twice as much grain as

• B、 twice more grain as

• C、twice as many grain as

• D、 as twice many grain as

52 (   ).

19. Bob said he wouldn't go to the party as he was busy, but he went there (   ).

• A、after all

• B、 above all

• C、at all

• D、in all