Some green beans, ______ long enough, can be poisonous (有毒的).
A．if not be cookedB．if not cookedC．if not cookingD．if not being cooked
B

試題分析：句意：一些綠豆如果煮的時間不夠久.可能會有毒。這里是表條件,而且是被動語態(tài),相當(dāng)于：Some green beans,if they are not cooked long enough, can be poisonous (有毒的). 當(dāng)主從句的主語一致的時候，可以省略從句的主語和be動詞，所以是B。
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