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A. Being separated B. Having separated C. Having been separated D. To be separated
分析：答案选 C。因为Australia与separate是被动关系，且separate发生在谓语动词has之前，所以用现在分词的完成被动式作原因状语。
二、考查非谓语动词的主动式与被动式
结合句子意思，考察非谓语动词与相应逻辑主语的关系，若为主动关系，用主动式；若为被动关系，用被动式。此时要特别注意，过去分词没有相应的被动式，因为它本身可以表示被动。如：
1. The repairs cost a lot, but it’s money well_____.
A. to spend B. spent C. being spent D. spending
分析：答案选B。因money与spend是被动关系，所以用过去分词。
2. The prize of the game show is＄30000 and an all expenses _____ vacation to China.
A. paying B. paid C. to be paid D. being paid
分析：答案选B。因all expenses与pay是被动关系，故用过去分词。注意句中的an 不是修饰 expenses，而是修饰vacation。
3. When _____help, one often says, “Thank you.” or “It’s kind of you.”
A. offering B. to offer C. to be offered D. offered
分析：答案选 D。因一个人说“谢谢”，应当是他被提供了帮助，所以要用过去分词，When offered help… =When he is offered help…
三、考查非谓语动词完成式的用法
非谓语动词（不定式、动名词和现在分词）的完成式主要表示发生在谓语动作之前的动作。做题时要注意根据题干所提供的语境来推断这种先后关系。如：
1. The storm left, _____a lot of damage to this area.
A. caused B. to have caused C. to cause D. having caused
分析：答案选D。因The storm与cause是主动关系，排除选项A；不定式作状语，前面通常不用逗号，排除B和C；因暴风雨给这个地区“造成损失”是在“结束”之前，所以用完成式。
2. More and more people are signing up for Yoga classes nowadays, _____ advantage of the health and relaxation benefits.
A. taking B. taken C. having taken D. having been taken
分析：答案选 A。因people与take advantage of是主动关系，排除选项B和D；take不会发生在谓语are signing up之前，不用完成式，排除C。
四、考查非谓语动词用作伴随状语
在通常情况下，表伴随情况的应用现在分词。如：
1. “You can’t catch me!” Janet shouted, _____away.
A. run B. running C. to run D. ran 分析：答案选B。现在分词作伴随状语。
2. He glanced over at her, ______ that though she was tiny, she seemed very well put together.
A. noting B. noted C. to note D. having noted
分析：答案选 A。因为he与note是主谓关系，且note与谓语动词glanced的动作同时发生，所以用现在分词的一般式作伴随状语。
3. Daddy didn’t mind what we were doing, as long as we were together, _____fun.
A. had B. have C. to have D. having 分析：答案选 D。用现在分词表伴随情况。