单项选择题

When first ______ to the market, the toys didn't attract much attention.

A．introducing
B．introduced
C．was introduced
D．being introduced
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单项选择题
Is this museum ______ you visited a few days ago
A．where
B．that
C．on which
D．the one
单项选择题
Teenagers shouldn't be ______ from school although they don't do well in studies.
A．disappeared
B．gone
C．removed
D．beaten
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