Jim plays chess ____ if not better than David.

选B [ Jim下象棋如果不比David好的话也和他一样好。]
as well as (和……一样好)，而“so well as”用于否定句，故排除。

B,as well as， 和……一样好。

选 B.

B .

Jim plays chess (as well as) if not better than David.

Jim的棋下的和David不相上下。

A
Jim的棋下得和大为一样好，可能比大为还更好些。

选B [ Jim下象棋如果不比David好的话也和他一样好。]
as well as (和……一样好)，而“so well as”用于否定句，故排除。