单项选择题

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

[A] having been lost
[B] to be lost
[C] losing
[D] lost

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单项选择题

Classification is a useful ______ to the organization of knowledge in any field.

[A] means
[B] approach
[C] mode
[D] manner

单项选择题

______ she wondered if she had made a mistake.

[A] Not until long afterwards that
[B] Not long until afterwards
[C] It was not until long afterwards that
[D] It was long afterwards until

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