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SAT语法改错A thick growth of sunflowers standing ten feet tall,t

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SAT语法改错
A thick growth of sunflowers standing ten feet tall,their brown heads drooped over the fence with the weight of their seeds,
A.standing ten feet tall,their brown heads drooping
B.stood ten feet tall,their brown heads drooping
选什么?为什么?
SAT语法改错A thick growth of sunflowers standing ten feet tall,t
选B.如果选A的话句子的两个动都为ing形式(非谓语形式),就没有谓语了.
stood是句子的谓语,而后半句their brown heads drooping over the fence with the weight of their seeds是前半句的伴随状语,表示stood的状态(是“垂着头地”).
动词的非谓语形式有:动名词(-ing)、不定式(to+v.)和过去分词(-ed),除了这三种形式的动词形式都为谓语形式.