单项选择题

There are no lights on and no one answer the doorbell. They ______ be at home.

[A] must not
[B] will not
[C] should not
[D] can not
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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
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
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