Anna was reading a piece of science fiction,completely ___ t

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Anna was reading a piece of science fiction,completely ___ to the outside world.
选项:a、having been lost b、 to be lost c、losing d、 lost

选D.lose的过去分词lost做伴随状语,也就是前面和后面两个分句的动作是同时进行的（伴随状语的条件）
如果你不懂语法,教你一个非常管用的技巧.凡是这种一个逗号隔开的类型的题目（考的部分/填空的部分一般都是缺主语的）,只需要在填空的部分加上主语还有be动词就容易理解了.比如这里加上之后就是She was completely lost to the outside world.lost是lose的过去分词,可以看成一个形容词（过去分词很多时候可以当做一个形容词来用）,lost作为形容词的意思是“丢失的,不见的”.

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