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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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
You must make ______ clear that no harm comes to her.
A．that
B．it
C．this
D．what
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