2. 外语
  3. Anna was reading a piece of science fiction, completely ______ to the outside world.

Anna was reading a piece of science fiction, completely ______ to the outside world.

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问题 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
答案D
解析 本题考查分词作状语。lost是lose的过去分词，可以直接作状语，表示伴随状态，前面无须接 have，故排除A 。B 表示将来的状态，与题意不符。lose是及物动词，后接宾语无需加to，故排除C 。lost与to构成短语be lost to，意为“对…无动于衷”，作状语时，可以省be，故答案为D 。
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