Some green beans, long enough, can be poisonous (有毒的).
A. if not be cooked
B. if not cooked
C. if not cooking
D. if not being cooked
网友回答
A. if not be cooked
(答案→)B. if not cooked
C. if not cooking
D. if not being cooked
解析：句意：一些绿豆如果煮的时间不够久.可能会有毒。这里是表条件,而且是被动语态,相当于：Some green beans,if they are not cooked long enough, can be poisonous (有毒的). 当主从句的主语一致的时候，可以省略从句的主语和be动词，所以是B。