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
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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
单项选择题
Jane has just ______ a letter from a friend of hers in England.
[A] returned
[B] answered
[C] offered
[D] replied
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