单项选择题

______ did he give you much advice

A．In what
B．On what
C．What
D．On 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 help
D．learning and helping
单项选择题
Paul doesn't have to be made ______ . He is always a hard-working student.
A．study
B．to study
C．studied
D．studying
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