单项选择题

Do you still remember ______ to Professor Lee during last visit

A．to have introduced
B．having introduced
C．to introduce
D．being introduced
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单项选择题
This international basketball match is Thailand ______ Japan.
A．to
B．with
C．versus
D．against
单项选择题
Marbles ______ once not confined to children.
A．was
B．is
C．were
D．are
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