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一道sat语法题Strong wind,sweeping almost unchecked over great dis

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一道sat语法题
Strong wind,sweeping almost unchecked over great distances,is a prime component of the grasland climate.
 
swept unchecked 是什么用法?
with almost unchecked sweeping over great distances 哪错了?
sweeping almost unchecked over great distances是划线部分。
一道sat语法题Strong wind,sweeping almost unchecked over great dis
sweeping unchecked 中 unchecked是过去分词作状语修饰sweeping 相当于形容词做伴随状语 与逻辑主语 Strong wind是主表关系 意思是 未受抑制的 不受限制的
with almost unchecked sweeping over great distances 错在 过去分词和现在分词 都缺 逻辑主语
应该是 with Strong wind almost unchecked sweeping over great distances ,it is a prime component of the grassland climate.
所以sweeping almost unchecked over great distances是正确答案.