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Some green beans , ____ long enough , can be poisionous. 逗号后

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Some green beans , ____ long enough , can be poisionous. 逗号后面是什么成分,cook主动表被动么?省略句?主谓一致? A if not to be cooked B if not cooked C if not cooking D if not being cooked
解题思路: if not cooked long enough= if they are not cooked long enough.条件状语从句:if (they are) not cooked long enough, 在if引导的条件状语从句中,如果从句的主语与主句的主语相同,且有BE动词时,主语和BE可省略.故they are 是可以省略的。
解题过程:

Some green beans, if not cooked long enough, can be poisonous. 有些青豆,如果煮的时间不够长,会有毒的。=Some green beans can be poisonous if they are not cooked long enough.

故选B

最终答案:略