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
______is often the case with children, Tom was completely better by the time the doctor arrived.
A．It
B．As
C．What
D．Which
单项选择题
His sister always spends so much ______ clothes that she Can't manage to live within her income.
A．for
B．in
C．at
D．on
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