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
______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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