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单选(现在分词短语在句中可以作结果状语)

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Their car was caught in a traffic ,thus __the delay .a.causing b.caused c.to cause d.to have caused.为什么选a,b是被动还是过去式,新年快乐
解题思路: causing和主语Their car was caught in a traffic jam是主谓关系,所以用ing.分词短语在句中作结果状语
解题过程:
causing和主语Their car was caught in a traffic jam是主谓关系,所以用ing.分词短语在句中作结果状语
现在分词短语在句中可以作结果状语,它的逻辑主语便是句中的主语,该短语相当于一个结果状语从句,且用主动语态。分词短语在句中作结果状语时,通常位于句末,中间有逗号。有时为了加强语气,就在分词前加thus。
Their car was caught in a traffic jam, thus causing the delay.
= Their car was caught in a traffic jam, thus it caused the delay. 他们的车遇上交通阻塞,因而耽误了。caused是个被动,但和主语Their car was caught in a traffic jam不是被动关系排除。
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最终答案:略