单项选择题

He found it necessary for us ______ from each other.

[A] to help and learn
[B] helping and learning
[C] to learn and to help
[D] learning and helping

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单项选择题

The book ______ by a famous writer.

[A] was believed to write
[B] believed to be written
[C] was believed to be written
[D] believe to write

单项选择题

______is often the case with children, Tom was completely better by the time the doctor arrived.

[A] It
[B] As
[C] What
[D] Which

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